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

In the village of Parkstein in the Upper Palatinate, the Parkstein Ruin stands on a basalt cone. Once among the largest fortifications in the region.
History+
The Veste Parkstein was first documented in 1052 when it was destroyed by fire. After its reconstruction, it served as the seat for the counts of Sulzbach and their ministerials, the Lords of Parkstein. In the 12th century, the castle came into the possession of Frederick Barbarossa, followed by Duke Otto II of Bavaria in 1251. Later owners included the Imperial City of Nuremberg, Bohemia, the Leuchtenbergers, and finally the Wittelsbachs. The demolition of the complex began in the mid-18th century. For instance, in 1756, ashlar stones from the powder tower were used to build the tower of Weiden's parish church.
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: 49.7319, 12.0700