Hohenzollern Castle
With over 350,000 visitors per year Hohenzollern castle is one of the most visited castles in Germany. The castle is privately owned by the House of Hohenzollern, with two-thirds belonging to the Brandenburg-Prussian branch, and the balance to the Swabian branch. Since 1952, the Princess Kira of Prussia Foundation has used the castle for an annual summer camp for children. Whenever Prince George and his family are staying at the castle, the Prussian flag flies over the castle.
Frankenstein Castle
In 1978, American airmen from the 435th Transportation Squadron stationed at Rhein-Main Air Base started an annual Halloween festival at the castle, which became one of the biggest Halloween festivals in Europe. In 1977, the 440th Signal Battalion organized a 13 km running competition routed along steep forest trails from Cambrai-Fritsch Army Housing Site in Darmstadt to the castle. The Frankenstein "Castle Run" was held until 2008 when all American forces left Darmstadt. The city of Darmstadt organized a final race in October 2008.
A restaurant with a sun terrace, located right below the castle towers, offers regular service as well as special events (e.g., "Horror Dinner Nights").