Hohenasperg, located in the federal state of Baden-Württemberg near Stuttgart, Germany, of which it is administratively part, is an ancient fortress and prison overlooking the town of Asperg.
It was an important Celtic oppidum, and a number of very important "princely" burials are close by, in particular the Hochdorf Chieftain's Grave.
Wikipedia https://en.wikipedia.org/wiki/Hohenasperg
Official Website http://www.foerderverein-hohenasperg.de/
Address 11 Hohenasperg, 71679, Germany
Coordinates 48°54'36.293" N 9°8'17.695" E