Berlin, DE
From 1941, 12.000 tons of concrete in a 15 metre high and 20 metre-diamater cylinder were built to test the load-bearing capacity of the Berlin soils for Albert Speer's ''Germania''-Buildings. Too massive for later blasting, this is one of the more bizarre remains of the Third Reich.
Listen to the audio guide for Informationsort Schwerbelastungskörper Free on WIP — starts by itself when you arrive, even with the screen off