Siegfried Line Museum, Pirmasens, Military museum in Niedersimten, Pirmasens, Germany.

The Siegfried Line Museum is housed in the Gerstfeldhöhe fortification, a bunker-like complex begun in 1938. Kilometre-long vaulted galleries were blasted and hewn into solid rock, intended for an underground narrow-gauge railway to carry soldiers and equipment to battle positions near the French border. Two decommissioned tanks mark the entrance.

Construction of the Gerstfeldhöhe fortification began in 1938 as part of the Siegfried Line defense system built into the rock. After the war, occupation forces adapted the facility for storage and other purposes before it became a museum.

The museum is run by the Gerstfeldhöhe society together with the town of Pirmasens and calls itself a memorial to peace, not only a war display. Mannequins in Wehrmacht and Nazi Party uniforms stand in a faithfully rebuilt soldiers' quarters, and the walls carry comments written by American soldiers who stored vehicle spares here until the early 1990s.

Visitors should prepare for cool underground conditions, as the tunnels maintain temperatures around 8 degrees Celsius year-round. Exploring the site with a guide provides the best understanding of the complex tunnel system and its layout.

The tunnel walls still bear messages and marks left by American soldiers who used the facility as storage space until the 1990s. These handwritten inscriptions offer glimpses into the lives and thoughts of troops who occupied these spaces decades after the war.