La Coupole, also known as the Coupole d'Helfaut-Wizernes, is a significant Second World War bunker complex located in the Pas-de-Calais department of northern France. Situated approximately 5 kilometres (3.1 mi) from Saint-Omer and about 14.4 kilometers (8.9 miles) south-southeast from the coast, this fortress played a crucial role in Germany's military strategy during the war. The construction of La Coupole was initiated in late 1942 as part of Hitler's directive to build hardened blockhaus structures in northern France. These fortifications were designed to house and launch V-2 rockets, which were intended to attack England. The complex was originally codenamed Bauvorhaben 21 ('Building Project 21') or Schotterwerk Nordwest (Northwest Gravel Works).
La Coupole is an impressive example of military engineering and fortification from the WWII era. The bunker complex is characterized by its massive dome structure, which was intended to protect the V-2 rockets and their launch facilities from Allied bombing raids. The site features extensive underground tunnels and reinforced concrete bunkers, showcasing the advanced construction techniques employed during the war. Despite never being fully operational for its intended purpose, La Coupole stands as a testament to the scale and ambition of Germany's military efforts during the Second World War.
Today, La Coupole serves as a museum and memorial, offering visitors a glimpse into the military history of the region. The site provides educational exhibits on the V-2 rocket program, the Atlantic Wall, and the broader context of WWII in northern France. The museum also includes interactive displays and guided tours, making it a popular destination for history enthusiasts and those interested in urbex and military heritage.