Magrethenberg, the muzzle of a 15cm gun peeks out of the bunker. Artillery fort Furggels was in military use from 1946 to 1998 and is now open to the public as a museum.

Over 750,000 bunkers were built, though many have been removed to make way for urban development or blown up by scrap merchants to harvest and sell their steel. But many still remain, abandoned ...