Ouvrage Galgenberg

Ouvrage Galgenberg is an underground military fortification spread across multiple blocks within the forest, accessible through two entrances on its eastern side. The complex features interconnected tunnels, ammunition storage, generators, and other operational structures built before World War II.

Built between 1931 and 1934 as part of France's Maginot Line defense system, the fortification was created to guard against threats from the north. It remained undamaged during the 1940 combat and was repurposed several times afterward, including as a shelter during later conflicts.

The fortification reveals how soldiers lived and worked in the 1930s, with sleeping quarters, kitchens, and offices still visible throughout the complex. These spaces show visitors what daily life was like inside an underground military stronghold.

The site is well connected by walking paths and can be explored on foot, with underground areas remaining cool and damp year-round. Visitors should wear sturdy shoes and expect uneven surfaces and narrow passages when moving through the tunnels.

The original electrical generators from the 1930s still function and are regularly inspected to demonstrate their mechanical operation. These machines are rare examples of fully preserved industrial equipment from that era.