La Coupole, a Second World War bunker complex located near Saint-Omer in the Pas-de-Calais department, France, was constructed in 1943 as part of Germany's defensive strategy in northern France. Designated Bauvorhaben 21 and Schotterwerk Nordwest, the site served as a strategic military installation during World War II, positioned 5 kilometers from Saint-Omer and 14.4 kilometers south-southeast of Dunkirk.
Its proximity to the Maginot Line highlights its role in the broader French defensive network, though it was not part of the original Maginot Line fortifications. The bunker's design and purpose reflect the German military's focus on coastal defense and counter-attack preparedness in the region. Today, the site is a verified historical landmark, offering insights into WWII military engineering and the complex interplay of fortifications along the French coast.
The area remains a key site for studying military history and World War II fortifications in Europe.