Fort Schoenenbourg (Maginot Line)

The Maginot Line (Ligne Maginot), named after French Minister of Defense André Maginot, was a line of concrete fortifications, tank obstacles, artillery casemates, machine gun posts, and other defenses, which France constructed along its borders with Germany and Italy, in the light of experience from World War I, and in the run-up to World War II. Generally the term describes only the defenses facing Germany, while the term Alpine Line is used for the Franco-Italian defenses.

http://en.wikipedia.org/wiki/Maginot_Line