📜 Largest artillery fortress in Czechia, built 1935-1938, never fully completed. Built against Hitler's Germany, part of a unique complex. 🔍 Features a historical exhibition inside bunker T-S 73 and extensive underground passages. # Why Go 🏰 Explore over 3 km of underground passages up to 52m deep 📚 Learn about Czechoslovakian fortification history and WWII 🚶♂️ Hike a scenic educational trail, discovering various bunkers, trenches, and a lookout tower 🖼️ See unique models and historical exhibits in T-S 73 👨👩👧👦 Engaging activities for families and children # Why Avoid 🥶 Underground is cold (9°C) 🪜 Many stairs (186) to descend and ascend # Tips 🧥 Bring warm clothing for the underground tour 🐶 Dogs allowed on leash and with muzzle in underground (check at ticket office) 🅿️ Parking available about 0.5 km from the main museum # Cost 💰 Adults 200 Kč, children (6-15) 100 Kč, family (2+2) 500 Kč. # Hours 🕒 Daily in July-August, weekends/holidays in April-June, September-October.