Budapest caves: Szemlö-hegyi, Pál-völgyi and other underground sites

Budapest is famous for its thermal baths, steaming pools and Art Nouveau hammams… but the thermal waters have shaped another, much more secret side of the city: the caves of Budapest, nestled in the heart of the Buda Hills. Nearly 200 caves have been recorded beneath Budapest, an exceptional concentration that has earned the city the nickname "cave capital."

During my stay, I chose to visit two emblematic caves that are easy to reach by public transport: the Szemlö-hegyi Cave (Szemlő-hegyi-barlang) and the Pál-völgyi Cave (Pál-völgyi-barlang). Szemlö-hegyi is the easiest and most family-friendly, while Pál-völgyi offers a more spectacular and more physically demanding route, with more than 400 steps.

In this article, I'll take you with me into these two caves, explain how to organize your visit, how to link the two in a single morning, and what more physically demanding experiences are possible if you enjoy caving. I'll also tell you about other remarkable underground sites in Budapest – the Molnár János Cave, the Mátyás-hegy area and the Buda Castle Cave – to help you choose the ones that fit your trip best.

The caves of Budapest at a glance

Budapest has nearly 200 recorded caves, mainly in the Buda Hills. Several sites now let you discover this underground heritage, from family-friendly walks to sport caving, as well as the Molnár János Cave, best known among divers.

Why Budapest is nicknamed the "cave capital"

Under Budapest, and especially under the Buda Hills, nearly 200 caves have been recorded. Some are connected to each other to form vast underground systems: the Pál-völgyi system currently reaches around 32 km of known passages (about 20 miles).

Budapest's geology is closely linked to its hydrothermal activity. As they rose through fissures in the limestone and dolomite, hot, mineral-rich waters gradually dissolved the rock and helped carve out the cavities that you visit today. This geological history is closely tied to that of the thermal springs that made the Budapest baths famous, even if it would be an oversimplification to speak literally of the "same water."

Some cavities have also had very different uses over time: sites of scientific exploration, therapeutic spaces, refuges or shelters during wartime. Today, the underground world of Budapest can be discovered in several ways: guided tours along developed paths, caving with narrow passages, speleotherapy and, in the case of Molnár János, cave diving reserved for sufficiently experienced divers.

The main caves to visit in Budapest

To help you quickly find your way among the different options, here are the main underground sites to consider during a stay in Budapest.

Visiting the Szemlö-hegyi cave

The Szemlö-hegyi Cave is the most accessible of Budapest's caves, ideal for a gentle first introduction, including with children, a stroller, or if you want to avoid stairs.

When I arrived at the Szemlö-hegyi Cave, the heat on the surface was almost oppressive, over 35°C (about 95°F) during my stay in Budapest. The very idea of stepping into a place where it was around 12°C (about 54°F) all year round suddenly sounded very appealing. In front of the entrance, I was expecting a dense crowd after seeing the excellent ratings on Google and social media… but tourism can be unpredictable: despite the excellent reviews, only a Hungarian couple was waiting for the tour.

After buying my ticket, I had a bit of time to look around an exhibition devoted to speleology and the underground world of Buda in the visitor building. These days, the site also offers a 3D film that lets you glimpse parts of the Buda caves that are not open to the general public.

How does the visit to Szemlö-hegyi work?

The Szemlö-hegyi cave can be visited only as part of a guided tour. The tour lasts about an hour and follows a developed path, without any particular difficulty, which makes it the most accessible of the major tourist caves in Budapest.

The guide's explanations are generally given in Hungarian, but a free audio guide app is available in several languages, including English. This way, you can follow the commentary throughout the tour without depending on the language spoken by the guide.

During my first visit, it was much more basic: I was given a leaflet in French while the tour was conducted in Hungarian. The audio guide format is much more comfortable for foreign visitors.

The visit is still very visual, however: even without following every geological detail, the rock formations, large fissures, and characteristic concretions of the cave are easy to discover as you move along the route.

The history and formation of Szemlö-hegyi

The Szemlö-hegyi cave was discovered in 1930 and opened to the public in 1986. The known network today is about 2.2 km long (about 1.4 miles). The developed route open to visitors is about 500 m (about 1,640 ft) and lets you see the cave's main geological curiosities.

In the 1970s, an access tunnel was dug to make it easier for visitors to get in. You start the tour through this passage before reaching the more spectacular parts of the cave. The subsoil here is largely composed of limestone containing many fossils (mollusks, sea urchins, etc.). Tectonic movements fractured this rock, creating pathways for underground water.

Unlike caves mainly carved out by cold water descending from the surface, Szemlö-hegyi is a cave of hydrothermal origin. Warm waters rising through fractures in the rock gradually dissolved the limestone and hollowed out the cavities. When the hydrological conditions changed, these galleries were left open to the air. This process explains the characteristic shapes you see today in several caves in the Buda hills.

Chambers and rock formations to look out for

The first large chamber you come to is the Ferencváros chamber. The Szemlö-hegyi cave is several hundred thousand years old, and this chamber is particularly rich in calcite. An impressive white vein has been nicknamed the "mother-in-law's tongue" because of its elongated shape that seems to emerge from the wall.

Interestingly, this chamber was only discovered in 1973, long after the cave itself was first found. The rock formations leave plenty of room for imagination: some visitors see a ship, a polar bear, a bunch of grapes, or even the outline of the African continent.

You then cross a concrete bridge overlooking a cavity filled with "cauliflower" formations, which are characteristic of Szemlö-hegyi's hydrothermal origin.

Farther on, a long corridor reveals deep fissures left by the flow of underground water. You can see a delicate stack of calcite membranes forming a cone, nicknamed "the cave's Christmas tree." It is one of the spots where you can best appreciate the subtle work of water over time.

You then pass through the Maria chamber, named in tribute to speleologist Maria Szekula. Thanks to her slender build and boldness, she managed to squeeze through a tiny crack and discover this chamber. Later, a wider passage was created so the public could visit it without having to crawl.

Along the way, the cave reveals even more formations, so varied that it is sometimes nicknamed the "underground flower garden of Budapest".

Speleotherapy and the cave's unusual acoustics

At the entrance to the "giant corridor," the rock face seems to form a witch's face with a hooked nose, which I've pointed out for you below with a small arrow on the rock.

This is where I learned that the cave has also been used for speleotherapy since the early 1990s. Its very humid, stable, low-dust air is used as part of treatment programs, particularly for some people suffering from respiratory conditions. Therapeutic sessions are still held in a specific area of the cave.

If these topics intrigue you, you can also complement this visit with a trip to Budapest's underground hospital, also located in the Buda hills, but offering an immersion in history rather than geology.

The guide then let us wander around the deepest part of the cave, more than 45 m (about 148 ft) below the surface. She took the opportunity to play "Mariage d'amour," performed by George Davidson, a piano piece that resonated in a very distinctive way in the natural acoustics of the cavity. It was a suspended, quite unexpected moment that added an almost intimate dimension to the visit.

At the far end of this developed section, a ladder marks the beginning of a segment of the cave closed to the public, the "Kadic Section," which you can glimpse without being able to enter on the standard tour.

On your way back up, take a look to the left: you'll see the tiny passage through which the cave was originally explored. It gives you a good sense of the courage of the first speleologists. The visit then came to an end and I left with the feeling of having discovered a singular and peaceful place, even if the cave is still less spectacular than some of the show caves I've visited in France. Above all, it's a welcome break from the summer heat and a place that invites contemplation, far from the hustle and bustle of the city.

Visit to the Pál-völgyi cave

The Pál-völgyi cave offers a more challenging and spectacular experience than Szemlö-hegyi, with lots of stairs, steeper passages, and striking rock formations.

To reach the Pál-völgyi cave, I walked from Szemlö-hegyi. The contrast was immediate: while the Szemlö-hegyi building was quite plain and concrete, Pál-völgyi felt much greener, with a few picnic tables around the site. Today, the cave has a proper visitor center, set up in the former quarry guard's house, with a ticket office, a shop, and an interactive exhibition dedicated to geology, hydrology, cave protection, and bats.

During my visit, there were only a few of us taking part. Two young guides arrived, smiling. One of them was finishing her training under the supervision of the other and explained to me, a little moved, that this would be her very first guided tour on her own. She was all the more pleased that I spoke English, because it gave her the opportunity to do the tour in both Hungarian and English.

I realized how pleasant it was to visit a place with someone who really wanted to share their passion. Her enthusiasm made the tour especially engaging, with plenty of extra anecdotes along the way.

Today, standard tours are offered in Hungarian, with an audioguide app available in English. Groups are limited to a maximum of 35 people.

A huge underground network… of which you will only see a small part

We entered the Pál-völgyi cave. It was discovered in 1904 in a former stone quarry located along what is now Szépvölgyi út. At the time, the first explorers knew only a few hundred meters (about 650–1,000 ft) of it.

Over the decades, research revealed a much larger network. After connecting several underground sections, the Pál-völgyi system today stretches for around 32 km of known passages (about 20 miles), making it the longest cave system currently known in Hungary.

For the general public, only a small part is developed: the tourist route is about 500 m long (about 1,640 ft) and takes around an hour to visit. It still lets you see a nice variety of formations: concretions, calcite crystals, fossil shell imprints, narrow passages, and large changes in elevation.

A more active visit, with more than 400 steps

The visit to Pál-völgyi is clearly more physical than that of Szemlö-hegyi. In about an hour, you go down and back up more than 400 steps, with several steep climbs and descents. You also have to climb a fairly steep staircase about 7 m high (about 23 ft), secured by a handrail, the equivalent of two and a half floors.

This more demanding route explains why access is forbidden to children under 5 and to people measuring less than 115 cm (about 3 ft 9 in). The cave is also not suitable for people with mobility difficulties.

For everyone else, the route is still perfectly manageable if you are comfortable with stairs. The temperature stays around 11°C all year round (about 52°F), so you might want to bring a sweater or jacket, even in the middle of summer, as well as comfortable shoes with good grip.

Impacts of tourism and the cave's fragile life

Pál-völgyi is not just a tourist site: it is also a protected natural environment, closely monitored by national park specialists. The cave is in particular an important habitat for several bat species, which you can sometimes observe during their hibernation period on special tours dedicated to underground wildlife.

Artificial light can also locally alter the cave environment, especially by encouraging the growth of algae and moss on certain walls. The lighting is therefore used in a controlled way to limit the impact of tourism on this fragile ecosystem.

During my visit, the guide stressed again and again how fragile this environment is and how important it is not to touch or remove the rock formations. It is a good reminder: what seems immobile and robust on a human timescale is actually the result of extremely slow geological processes.

Remarkable formations and a plunge into darkness

The tourist route in Pál-völgyi is dotted with geological features that appeal as much to science enthusiasts as to visitors who enjoy spotting shapes in the rock. The cave is particularly known for its tall fissure-shaped galleries, its calcite crystals, its concretions, and its rounded erosion patterns that are characteristic of its hydrothermal origin.

Along the way, some formations look like animals or characters and have been given vivid nicknames – scorpion, elephant, crocodile…

We passed under the "sword of Damocles", a huge block of rock on the ceiling that seems to be hanging just above our heads.

A little further on, some small limestone columns have been nicknamed Snow White and the Seven Dwarfs.

It was in this chamber that the guide chose to turn the lights off completely to show us what cave darkness was really like. Instantly, we were plunged into total blackness, where we couldn't even see our own hands. Only the faint sound of dripping water broke the silence. Imagining the first explorers moving forward here by the light of a rudimentary lamp made their work seem even more impressive.

In some places, you can still see the old ladder fixtures used by cavers.

At the end of the tour, I really felt that Pál-völgyi was more striking than Szemlö-hegyi, both because its route was more varied and because of the richness of its formations. If you are short on time and have to choose, this is the cave I would recommend you prioritize, provided you are comfortable with stairs.

How to visit the caves of Budapest (Szemlö-hegyi and Pál-völgyi)

The Szemlö-hegyi and Pál-völgyi caves are both accessible by public transport from Buda and can easily be visited one after the other on the same day. The most convenient plan is to start with Szemlö-hegyi, where tours depart on the hour, then walk to Pál-völgyi for a tour at a quarter past the hour.

Access to the caves of Budapest by public transport

To get to Szemlö-hegyi, take bus 29 from Szentlélek tér toward Hűvösvölgy, and get off at the Szemlő-hegyi-barlang stop. The entrance to the cave is then a short walk away.

To go directly to Pál-völgyi, take bus 65 from Kolosy tér toward Szépvölgyi dűlő, and get off at the Pál-völgyi cseppkőbarlang stop. The ticket office is located in the visitor center on the other side of the road.

If you visit both caves, there is no need to take the bus between the two: Szemlö-hegyi and Pál-völgyi are about 1 km apart (about 0.6 miles) and can easily be reached on foot in around ten minutes.

Opening hours, tickets, and recommended order of visit

In practice:

• At Szemlö-hegyi, tours depart every hour at 10:00, 11:00, 12:00, 13:00, 14:00, 15:00, and 16:00. The cave is open all year except on Tuesdays and certain public holidays.
• At Pál-völgyi, tours depart every hour at 10:15, 11:15, 12:15, 13:15, 14:15, 15:15, and 16:15. The site is closed on Mondays and certain public holidays.

As schedules may change, remember to check them before your visit on the official Danube-Ipoly National Park website:

• Opening hours, access, and practical information for Szemlö-hegyi;
• Opening hours, access, and practical information for Pál-völgyi.

A combined Szemlö-hegyi + Pál-völgyi ticket is available. In 2026, it costs 5,900 HUF at the full rate (about €15 / $16 / £13), compared with 3,900 HUF (about €10 / $11 / £8.50) for a single-entry ticket to just one cave. It is therefore the most cost-effective option if you would like to visit both on your own.

A smooth schedule could look like this:

• 10:00 – Start of the Szemlö-hegyi tour.
• Around 10:40–11:00 – End of the tour depending on the day's format, then walk to Pál-völgyi.
• Before 11:05 – Arrival at Pál-völgyi and purchase or validation of the ticket.
• 11:15 – Start of the Pál-völgyi tour.
• Around 12:15 – End of the tour.

Please note: at Pál-völgyi, you are asked to buy your ticket at least 10 minutes before departure. So leave yourself a bit of leeway between the two visits.

In the other direction, linking the visits is less convenient: a tour of Pál-völgyi starting at 10:15 ends around 11:15, which makes you miss the 11:00 departure at Szemlö-hegyi and wait until noon.

Hence my recommendation: start with Szemlö-hegyi, then walk to Pál-völgyi. You cut down your waiting time and finish with the cave I found the most spectacular.

Access conditions, children, and equipment to plan for

The two caves have very different access conditions.

• Szemlö-hegyi is particularly suitable for families. Its developed route is accessible to strollers and wheelchairs, which makes it the best option with young children or in case of reduced mobility.
• Pál-völgyi is off-limits to children under 5 and to people measuring less than 115 cm (about 3 ft 9 in). It is not suitable for people with mobility difficulties because its route is much more physically demanding.

In all cases, plan for:

• A warm jacket or sweater: it is around 12°C (about 54°F) in Szemlö-hegyi and 11°C (about 52°F) in Pál-völgyi all year round.
• Comfortable shoes with good grip, especially for Pál-völgyi.
• Practical clothing that does not restrict your movements on the stairs.

Standard tours are guided in Hungarian, but both sites now offer an audioguide app available in English. At Pál-völgyi, private tours in English can also be arranged in advance for an additional fee.

Caving in the caves of Budapest

In addition to the standard tours of Szemlö-hegyi and Pál-völgyi, Budapest offers guided caving trips into the undeveloped parts of the Buda underground network. It is a much more challenging caving experience, with narrow passages, sections where you move on all fours, and sometimes real climbing sequences.

A caving trip in the Pál-völgyi network

If you want to go beyond the regular visitor routes, you can join a guided caving tour lasting several hours in the non-touristic parts of the Pál-völgyi network.

Danube-Ipoly National Park in particular offers outings that combine an initial geological introduction at Szemlö-hegyi with about 2.5 to 3 hours of more challenging exploration in the undeveloped parts of the Pál-völgyi system. Coveralls, helmet, and headlamp are provided.

Here, there are no more stairs or walkways: you move through natural galleries, sometimes on all fours or crawling, with narrow passages that require good mobility. These outings are done in small groups and with a specialized guide.

This type of outing requires good physical condition and feeling relatively comfortable in confined spaces. However, you do not need to be an experienced caver: the supervision and equipment are designed to allow beginners with a reasonable level of fitness and mobility to discover this type of environment.

Other caves in Budapest: Molnár János, Mátyás-hegy, and the Buda Castle Cave

Beyond the developed routes of Szemlö-hegyi and Pál-völgyi, Budapest has other remarkable underground sites. Some are reserved for very specialized activities, while others are easier to visit on a guided tour.

Molnár János Cave and cave diving in Budapest

Molnár János Cave (Molnár János-barlang) is located under Buda, close to the Danube. It is a vast karst network that is largely flooded, fed by thermal waters.

The water temperature varies depending on depth, at around 20 to 28°C (about 68 to 82°F), and its remarkable clarity contributes to the site's international reputation among cave divers.

For a typical traveler, this is not a show cave: there is no developed walking route that you visit on foot like at Szemlö-hegyi or Pál-völgyi. The main appeal of the place lies in cave diving, organized by the specialized dive center located on site.

The cave is intended primarily for experienced divers. Divers who are already certified in cave diving can join dives adapted to their level, but there are also introductory options for certain divers who do not yet have that certification. You need to have at least an Advanced Open Water level and solid diving experience; the center then assesses the access conditions based on your profile and the type of dive planned.

It is therefore a very different experience from the other caves mentioned in this article and intended for people who are already familiar with diving.

Mátyás-hegy: a sport caving area

The name Mátyás-hegy often comes up when you look into caving in Budapest. Today, it is not a separate tourist cave comparable to Szemlö-hegyi: this area belongs to the large underground complex connected to the Pál-völgyi system.

It is specifically in these undeveloped sections that some sport caving excursions can take place. You move through them in a suit, with helmet and headlamp, in natural galleries where you sometimes have to crawl or squeeze through narrow passages.

If you're simply looking for an easy introduction to Budapest's caves, you might prefer Szemlö-hegyi or Pál-völgyi. Mátyás-hegy mainly becomes relevant if you are looking for a real guided caving experience.

Buda Castle Cave: between geology and history

Beneath the Buda Castle district lies an underground network that is very different from the Szemlö-hegyi and Pál-völgyi caves: the Buda Castle Cave, or Buda Castle cave.

This system, about 3.3 km (about 2 miles) long, combines natural cavities carved into limestone with spaces that have been modified by humans over the centuries. Some sections have served as cellars, storage areas, shelters during World War II, and even a prison.

Two types of guided tour are currently offered:

• A short tour of about 600 m (about 0.4 miles) lasting 45 minutes.
• A classic tour of about 1.5 km (about 0.9 miles) lasting 1 hour 30 minutes.

The routes are lit and developed, but the age requirements differ: the short tour is recommended from age 5, while the longer route is recommended from age 12. The temperature stays around 12°C (about 54°F).

Tickets must be purchased online in advance: they are not sold at the entrance.

Be careful not to confuse the Buda Castle Cave managed by the national park with the Labyrinth of Buda Castle (Budavári Labirintus), a separate underground attraction. Even though both are under the castle district, they are not the same visit.

What budget should you plan for visiting the caves of Budapest?

Visiting Budapest's caves is still relatively affordable, especially if you choose the classic routes at Szemlö-hegyi and Pál-völgyi.

Ticket prices for Szemlö-hegyi and Pál-völgyi

In 2026, plan for:

• 3,900 HUF per adult to visit a single cave, Szemlö-hegyi or Pál-völgyi.
• 5,900 HUF per adult for the combined ticket giving access to both caves.
• 2,800 HUF for a reduced-fare ticket for one cave and 4,700 HUF for the combined reduced-fare ticket, provided you meet the required conditions.

If you are planning to visit both caves, the combined ticket offers much better value: it works out much cheaper than buying two separate entries.

Since prices can change, check them before your visit on the official pages:

• Practical information about Szemlö-hegyi;
• Prices and practical information about Pál-völgyi.

The caving trips and themed tours have their own prices, generally higher than those of the standard visits. Their cost depends on the duration, the route, and the equipment provided, so it is better to check directly the price of the specific excursion you are interested in.

On top of this budget, simply add the cost of public transportation to reach the caves, unless your transportation ticket or pass already covers it.

Visiting Budapest's caves with children

Budapest's caves can make a very good family outing, as long as you choose the one that matches the age and abilities of the children. Szemlö-hegyi is by far the easiest with young children, while Pál-völgyi is more suitable for older children who can handle a more physical route.

Which cave should you choose with children?

For a visit with young children, Szemlö-hegyi is clearly the best option:

• The developed route is accessible to strollers and wheelchairs.
• The walk is easy and does not include the many steps you find at Pál-völgyi.
• The temperature stays cool all year round.
• The visitor center includes an interactive exhibition devoted to the caves and the underground world of Buda.

The site is also particularly designed with families in mind: the park above the cave also includes a playground and a short trail dedicated to Hungary's rocks.

Pál-völgyi is much more physically demanding. It is reserved for children who are old enough to handle a physically demanding route, with many staircases and several changes in elevation. Access is still prohibited for children under 5 and for people under 115 cm (about 3 ft 9 in) tall.

In both caves:

• Bring warm clothing, even in the middle of summer.
• Choose comfortable shoes, especially for Pál-völgyi.
• Let children know that a cave can be dark and that some parts of the visit may take place with very low lighting.

If you are traveling with a toddler or a stroller, I would therefore choose Szemlö-hegyi without hesitation. From 5 years old and 115 cm (about 3 ft 9 in), Pál-völgyi becomes an option, but I would still keep it for a child who is already comfortable with stairs and slightly more physical walks.

Caves and thermal baths: two sides of underground Budapest

A visit to Budapest's caves combines particularly well with a visit to the thermal baths: together they help you understand the major role played by hot waters in the geology and history of the city.

Linking your underground visit with the Budapest baths

Szemlö-hegyi and Pál-völgyi are caves of hydrothermal origin. Hot water rising up from deep underground circulated through fractures in the limestone and gradually dissolved the rock, creating the galleries and characteristic shapes that you see today.

This same geological context explains the presence of the many thermal springs in Budapest and, along with them, the development of the baths that are now among the main attractions of the Hungarian capital. Caves and thermal baths therefore show two sides of the same hydrothermal phenomenon, one hidden underground and the other much more visible on the surface.

Personally, I really enjoyed combining:

• A morning in the caves, in the cool, in an almost silent environment.
• The end of the day in a thermal bath, in a completely different atmosphere, between hot pools and historic decor.

It is a combination that I find particularly interesting if you want to understand Budapest in a different way: after seeing underground how water shaped the rock, you then find on the surface the whole bathing culture born from this particular geology.

If you are planning your trip, you can take a look at my guide to the Budapest baths to choose the one that best matches what you are looking for (family-friendly, historic, more local, etc.).

Traveler's memo for the Budapest caves

Here are the answers to the most frequent questions about visiting the caves of Budapest, to help you choose the right experience and organize your day under the Buda hills.

Visiting the Budapest caves reveals an unexpected side of the Hungarian capital, far from the monuments and thermal baths that usually take center stage. Between Szemlö-hegyi, which is more accessible, and Pál-völgyi, which is more spectacular, the two tours offer very different experiences.

You can easily see both in half a day, and in my opinion, they're among the most original things you can do in Buda. And if you want to go further, caving trips, diving in the Molnár János Cave, or the Buda Castle Cave show just how many other ways there still are to explore Budapest's underground world.