Fort de Tancrémont, Military fortification in Theux, Belgium.
Fort de Tancrémont is a military fortification near Theux built into the Ardennes landscape. The complex features armored gun turrets, observation posts, and an extensive tunnel system carved into slate bedrock below ground.
The fort was built in 1935 as part of the Liege defense line. It fell to German forces on May 29, 1940, after a brief period of resistance.
The name comes from a medieval battlefield nearby and reflects the region's long concern with defense. Today locals care for the site through a volunteer association that keeps its military story alive for people to understand.
Bring warm and waterproof clothing since underground areas stay cold and damp year-round. A flashlight helps you navigate the dark tunnel sections comfortably.
The underground section extends roughly 30 meters deep into the slate and includes fully equipped rooms such as a hospital and sleeping quarters. These subterranean facilities show how soldiers could live and work below ground for extended periods.
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