It began as one of Hitler's craziest ideas: to construct 4,000 kilometres of defences along the entire coastline of mainland Europe. Some 76 years later, local governments, private individuals and companies are trying to give a second life to sections of the infamous Atlantic Wall. In the Finistère department of Brittany in western France, a half-buried bunker now houses a museum featuring the voices of those who lived under German occupation. Meanwhile, an abandoned bunker on Brittany's Cap Fréhel peninsula is now home to a group of bats. FRANCE 24 takes a closer look at these sites and more.