Bock Casemates

The Bock Casemates are a vast network of underground tunnels and chambers carved into the sandstone cliffs of Luxembourg City over centuries of fortification. Originally built by the Spanish in 1644 and expanded by the Austrians, these passages once sheltered 35,000 people during wartime. Today, 17 kilometres of tunnels remain, offering a fascinating underground exploration with dramatic openings that frame views of the Alzette valley below. A UNESCO World Heritage Site and one of Luxembourg's most visited attractions.