Fort de Tancrémont near Pepinster represents a significant modernization of Belgium's Liège defenses, built in the 1930s as part of a four-fort expansion closer to the German frontier, complementing the original twelve forts. Inaugurated on August 8, 1937, this sophisticated observation fort contains an impressive underground network of nearly 2 kilometres of galleries located 20 to 28 metres below the surface, housing the command post, living quarters, power station, ammunition stores, and battle stations. Equipped with four cannons under protective domes, mortars, and machine-gun blocks, Tancrémont became legendary as the last Belgian fort to surrender on May 29, 1940, following the dramatic assault on the nearby Fort Eben-Emael. Today visitors can explore this preserved fortress and its small museum, opened in 2018 within the historic La Chapelle mill.
