Ouvrage Four-à-Chaux

Ouvrage Four-à-Chaux is a military fortress of the Maginot Line in Lembach with underground galleries extending several kilometers beneath the hills overlooking the Sauer valley. The fortification reaches depths of 30 meters below ground level.

The fortress was built in 1930 as part of France's defensive strategy along the border. German forces captured the installation in 1940 during the invasion of France.

The museum displays military equipment, living quarters, and operational rooms showing how soldiers experienced daily life in this border fortress. Visitors can see the spaces where troops lived and worked during their time here.

Visitors should wear comfortable shoes and warm clothing since temperatures stay constant at 14 degrees Celsius (57 degrees Fahrenheit) in the underground passages. The terrain inside requires steady footing and moderate physical fitness.

An innovative inclined rail system connects two separate entrances, with one positioned 24 meters higher for strategic defense advantages. This engineering solution reflects the technical sophistication of the era.

Location: Lembach

Inception: 1930

Part of: Fortified Sector of the Vosges

GPS coordinates: 48.99678,7.79773

Latest update: December 8, 2025 19:45