Fort de Liouville, Military fortification and museum in Apremont-la-Forêt, France.

Fort de Liouville is a stone military fortress with thick walls, underground passages, and several gun positions designed to defend the region. The site contains exhibition spaces displaying artifacts and information about soldiers' lives and military operations from that period.

Construction began in 1876 and was completed in 1880, at a cost of 2,108,000 francs, as part of the Séré de Rivières system. The fort was updated between 1892 and 1910, and in 1914 received a Mougin turret with two 155 mm guns. From 22 September 1914 it was bombarded; the Mougin turret was hit by a 305 mm shell but kept firing with one gun until 28 September, and the fort was evacuated on 30 September.

The fort shows how military engineers thought about defense and control in the late 1800s, with its thick walls and tight corridors built to survive cannon fire. Moving through these narrow passages gives visitors a sense of how soldiers lived and worked in confined conditions.

The site is walkable but stairs and narrow passages can be tiring, so wear comfortable shoes and move at your own pace. It is wise to bring warm clothing since the underground areas remain cool.

The fort's gorge, or entry side, faces German territory because it was built on a west-facing escarpment, and it was the only fort in the Hauts de Meuse line to receive concrete cover, though not concrete-protected barracks. Its Mougin turret was hit by a 305 mm shell but kept firing with one gun until 28 September 1914.