More Spanish Civil War Fortifications

As I mentioned in my last post, a friend and I recently explored a series of bunkers in the mountains north of Madrid. They dated to the Spanish Civil War and were part of Franco's siege of the capital. We also came across a couple of barracks. They all look pretty much the same. The concrete is about a foot thick, strong enough to hold off anything except a direct hit from a bomb or artillery shell. We found nothing inside although I suppose at the time there would have been bunk beds and some other simple furniture. The doorway was protected by a small curved wall and a firehole, but the other sides were blind, so these were not meant to be defended except in case of surprise.