Hohenzollern Castle sits on a mountaintop over the town of Bisingen, Germany. It is one of three castles built on the site, after the first two were destroyed by war, between 1846 and 1867. At one point, in 1945, is was home of the former Crown Prince Wilhelm of Germany. The castle houses historical artifacts of Prussian history, as well as othe artifacts like letters from the American Revolutionary War between President George Washington and Baron von Steuben of the Hohenzollern line. See Hohenzollern Castle via drone in this video.