The remains of the Castle can be visited
Schalksburg Castle (Ruin)

The ruins of Schalksburg, a former hilltop castle, stand at an elevation of approximately 906 meters in Laufen, a district of Albstadt in the Zollernalbkreis, Baden-Württemberg.
History+
Schalksburg, formerly also known as Schaltzburg or Schalksberg, shows traces of human settlement dating back to the Bronze and La Tène ages. Pottery finds from these periods, as well as from the Roman era, attest to the early importance of the site. The actual castle complex was built around 1100, although fortifications likely existed before 900. In 1266, Schalksburg was first documented. After a division of the Hohenzollern line in 1288, it became the seat of Frederick I, known as the Younger. In the 14th century, Schalksburg developed into a complex spanning three hectares.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 48.2344, 8.9200