The Bock Casemates are a vast underground defense network carved into the rocky promontory of the Bock, inscribed as a UNESCO World Heritage Site in 1994. Originally built by the Spanish in 1644 and expanded by Austrians, the tunnels once stretched 23 km and could shelter 35,000 soldiers. Today 17 km remain, with the most impressive sections open to visitors including windows carved into the rock offering stunning views.
Guided tours 18 EUR (adult), 14.50 EUR (seniors/students). Free with Luxembourg Card. Kulturpass rate 1.50 EUR on site only
Spring through autumn when the casemates are open. Book a timeslot online or purchase on-site. Allow 45-60 minutes for exploration. Cooler temperatures underground are refreshing in summer.
Located on the Bock promontory in the Old Town. Enter from Montee de Clausen near the Chemin de la Corniche. Walking distance from Place Guillaume II and the city center.
A labyrinth of underground tunnels and galleries carved into solid rock. Gun emplacements with panoramic views through rock windows. Archaeological remains dating to Roman times. Atmospheric corridors once used to defend the city. One of the longest underground defense systems in the world.
UNESCO World Heritage Site. Network of 17th-century underground tunnels and fortifications carved into rock. Open only from March to October/November (closed in winter). 17 km of tunnels, several sections open to visitors. Cool inside - bring a jacket. Steep stairs - comfortable shoes required
faq.subtitle Bock Casemates
At their peak, the Bock Casemates stretched 23 km and could shelter 35,000 soldiers and their horses. Today, 17 km of tunnels remain, though only a portion is open to visitors. They are among the longest underground defense systems in the world.
No, the Bock Casemates are typically closed during winter months (November to February). They reopen in spring, usually around March. Check the official website for current opening dates and hours before your visit.
Useful tips for visiting Bock Casemates
The fortress is free to enter and open 24/7. Best time for photos is golden hour. Multiple entrances—the main gate is most impressive. Walking the walls takes about 30 minutes.
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