The Atlantic Wall was built on the orders of Adolf Hitler as an extensive system of coastal defenses and fortifications designed to protect German-occupied countries from Allied attacks. This ambitious enterprise was realized using forced labor and required millions of tons of cement to build, along with industrial-grade steel reinforcing and armor plate. It was a colossal undertaking, the wall earmarked to run from the France-Spanish border all the way to the northern tip of Norway. Deemed impregnable by the Germans, the wall's formidable installations did indeed appear insurmountable. But that was before D-Day.
So, what is the story behind one of the most impressive military engineering feats of the Second World War? Click through and find out more about Germany's Atlantic Wall.