Castle Kransberg was grand and splendid, built piecemeal over the centuries to include watchtowers, half-timbered meeting halls, and stone walls. It had 150-odd rooms, including a wing that had been redesigned and renovated by Albert Speer in 1939, when Speer was still Hitler’s architect. At Hitler’s behest Speer added several state-of-the art defense features to Kransberg Castle, including a twelve-hundred-square-foot underground bunker complex, complete with poison gas air locks designed to protect inhabitants from a chemical warfare attack.

