Planning Your Visit to the Hot Spring Underground

The Hot Spring is the most powerful thermal source in the Czech Republic. It yields about 2,000 liters of mineral water every minute. When visiting the Hot Spring Underground, you enter the technical area beneath the modern colonnade. This area is vital for the city's spa operations.

The entrance is located within the Vřídelní kolonáda. This is a large, modern building in the center of the spa zone. You can easily find it by looking for the massive geyser shooting water into the air. Most travelers combine this tour with a walk to see lesser-known mineral springs map locations nearby.

In 2026, tours run regularly throughout the day. However, the underground is a controlled environment. Group sizes are limited for safety reasons. It is wise to plan your visit for the morning. This helps you avoid the largest crowds that arrive by bus in the afternoon.

Check the weather before you go. While the underground is sheltered, the humidity is very high. The temperature remains warm regardless of the season outside. This makes it a great rainy-day activity in Karlovy Vary. You can learn more about the city on the Karlovy Vary Official Tourism website.

How to Buy Tickets for the Underground Tour

Getting your entry pass is a straightforward process. You can purchase tickets directly at the information center inside the colonnade. For those who prefer planning, you should learn how to buy tickets for Karlovy Vary underground tour online. This ensures you have a spot during peak travel months.

Ticket prices are very reasonable for international travelers. Expect to pay around 160 to 200 CZK for an adult ticket in 2026. There are discounts available for children, students, and seniors. Always bring a valid ID if you want to claim a reduced rate. Payment can usually be made by cash or credit card.

Most tours are conducted in the Czech language. However, English and German speakers are well-supported. You can often request a printed guide or an audio device. If you have a specific language requirement, ask the staff before you pay. They are usually very helpful and speak multiple languages.

Decision Guide: Which Tour Should You Choose?

• If you are a solo traveler: Join a standard group tour for the best value.
• If you are with a large family: Book a private slot in advance to stay together.
• If you have limited mobility: Stick to the main geyser hall, as the tunnels have stairs.

Step-by-Step Guide to Visiting the Hot Spring Underground

Follow these steps to ensure a smooth experience. The tour is organized and follows a strict path for safety. Being prepared will help you enjoy the geological wonders without any stress.

1. Check Availability: Visit the ticket desk or website to see the next available tour time. These usually start every hour.
2. Secure Your Ticket: Pay the fee and keep your receipt. Typical cost is 180 CZK. Common mistake: Losing the ticket before the guide scans it at the gate.
3. Gather at the Meeting Point: Wait near the designated sign in the Vřídelní kolonáda hall. Arrive 10 minutes early.
4. Descend into the Tunnels: Follow your guide down the stairs. The tour takes about 45 to 60 minutes.
5. Observe the Petrification: Watch how the mineral water creates "stone roses" on souvenirs. This is the highlight of the tour.

• Checklist for your visit:
• Light jacket (even in summer).
• Comfortable walking shoes with good grip.
• A camera or smartphone for photos.
• Small bottle of plain water.

Exploring Hidden Tunnels and Aragonite Formations

Once you are underground, you will see the "Vřídlo" geyser from a new perspective. You can view the old distribution pipes that carry water to the local hotels. These pipes are often covered in thick mineral deposits. It shows the incredible power of the local spring water. You can see what to see in the vridlo underground colonnade to prepare for these sights.

The tunnels also reveal the historical foundations of the city. You will see 19th-century brickwork that has survived floods and reconstruction. The air is thick with the scent of minerals. It feels like stepping back into the history of Bohemian spa culture. The guide will explain how the geyser has been harnessed over the centuries.

One of the most famous sights is the collection of aragonite. This mineral forms beautiful, layered structures known as "thermal tufa." You will see stalactites and stalagmites forming in real-time. This geological process is fascinating to watch. It is one of the many hidden spots in Karlovy Vary that most tourists miss.

The tour also showcases the "petrification" process. Souvenirs like paper roses are placed in the mineral water. Over several weeks, they become coated in stone. You can buy these unique items in the gift shop later. It is a perfect reminder of your journey into the Earth.

Essential Tips for Your Underground Experience

The underground environment is unique. It is much more humid than the streets above. Wear clothes that you don't mind getting slightly damp. While it is not messy, the air carries a lot of moisture. This is especially true near the active geyser outlets.

Footwear is also very important. The floors can be slippery due to the mineral deposits and condensation. Avoid wearing flip-flops or high heels. Sturdy sneakers or walking shoes are the best choice. This will help you navigate the stairs and narrow passages safely.

Photography is generally allowed, but you should avoid using a flash. The bright light can be distracting to other visitors and the guide. Tripods are usually not permitted because the tunnels are quite narrow. Take quick photos so you don't fall behind the group. For more photography ideas, visit secret viewpoints in Karlovy Vary after your tour.

Respect the local rules regarding the water. Do not touch the mineral formations or the pipes. The oils from your skin can damage the delicate aragonite growth. Always stay with your guide and follow their instructions. This ensures the site remains preserved for future visitors in Visit Czechia programs.

Troubleshooting Your Underground Visit

Sometimes things don't go exactly as planned. Being aware of potential issues can save your day. If the underground tour is fully booked, don't worry. You can explore the postal court Karlovy Vary history instead. Then, come back later or book for the next morning.

If you feel claustrophobic, tell the guide immediately. The tunnels are safe but can feel tight in some sections. Most guides can help you exit quickly if you feel uncomfortable. It is better to speak up early than to wait. The main geyser hall is a great alternative for those who prefer open spaces.

Hungry after your tour? There are many great spots nearby. We recommend looking for non-touristy restaurants in Karlovy Vary to get an authentic meal. Avoid the cafes directly in the colonnade if you want better prices. A short walk can lead to much better dining options.

• Tour is sold out: Book online for the next day immediately.
• Language barrier: Use a translation app or ask for an English leaflet.
• Feeling too hot: Step away from the steam pipes and drink water.
• Slippery floors: Walk slowly and use the handrails provided.
• Missed your time: Ask the desk if they can move you to the next slot.
• No cash: Use the ATM located near the main entrance.
• Camera lens fogging: Wipe it with a microfiber cloth frequently.
• Accessibility: If you use a wheelchair, view the geyser from the main floor.