📜 Extensive underground military complex built by Nazis during WWII as part of Project "Riese". 🔍 Features 1500-1700m of tunnels, halls, and bunkers, opened to public in 1996. # Why Go 🕵️ Explore a mysterious Nazi WWII underground complex. 📜 Learn about Project "Riese" and its unknown purpose. 🚣 Experience unique tours, including an extreme boat route through flooded sections. 🗣️ English audio guides and tours available. # Why Avoid ⚠️ Not recommended for claustrophobia sufferers or very young children. 🥶 Low underground temperatures, dim, humid, and low corridors; bring warm clothes. ⏳ Tours can be booked out, arrive early. ⚠️ Some routes have age restrictions (5 and 8 years) and may require fitness. # Tips 🧥 Bring warm clothes and comfortable shoes. 🗣️ Book English tours or audio guides in advance, especially for extreme routes. 📞 Book special routes and group tours by phone. ⏰ Arrive early during high season to secure tickets. # Cost 💰 Prices vary by route; Historical Route 45 zł, Extreme Route 50 zł. # Hours 🕒 Daily, 10:00 AM - 5:00 PM (Sun-Tue) or 4:00 PM (Wed-Sat) for Historical Route. Hours vary by season and route. Closed Easter Sunday, Nov 1, Dec 25. # Parking 🅿️ On-site guarded car park available at the reception complex. # Wheelchair ♿ Available for people with disabilities and limited mobility on request.