In the northeast of France, a gray concrete block juts out between two rows of corn, with a rusted steel bell barely visible through brambles. This is part of the Maginot Line, an extensive underground military structure built between 1929 and 1935 along the Franco-German border. The Simserhof fort, one of the major artillery positions in the line, was designed to be self-sufficient, housing an electric plant, infirmary, workshops, and ammunition stores. The visible part is only a small portion of the complex; beneath the surface, tunnels connect barracks, storage areas, and firing positions, forming a system meant to allow soldiers to live, fight, and resist without ever needing to go outside. The Maginot Line was constructed in response to the devastation of World War I, as France sought to rethink its military strategy. The idea was to build permanent fortifications to channel enemy forces, protect key areas, and buy time for mobilization. The plan was to block Germany and Italy, forcing the Germans to attack through Belgium. However, this strategy failed in 1936 when Belgium declared itself neutral, leaving the Maginot Line without its expected northern extension. In 1940, the German army bypassed the Maginot Line entirely, advancing through the Ardennes and Belgium instead. Most of the fortifications remained intact but were ultimately useless. One exception was La Ferté, the last fort of the line, which was the only one to be directly attacked by German forces. Fermont, another major artillery fort, still bears the marks of an 88mm cannon's fire, which created a breach but did not lead to further advances by the enemy. After World War II, some parts of the Maginot Line saw limited military use before being abandoned. Others fell into disrepair, their tunnels flooded and silent. For example, Lembach was renovated for future use after the war but was later abandoned in the 1970s. A few fortifications have been preserved by enthusiasts, with about 14 open to the public and attracting over 200,000 visitors annually. These visitors come not only from France but also from neighboring Germany and Belgium, showing that the history of the Maginot Line extends beyond national borders. The majority of the Maginot Line remains hidden beneath the fields and forests of the Grand Est region. Some blockhouses now serve as shelters for bats, rusted bells lie among grazing cows, and tunnels slowly collapse under the weight of time. Though the line never fired a decisive shot, it continues to shape the landscape of the region nearly a century after its construction.