The remains of the castle can be visited
Scharfenstein Castle
The castle ruin of Scharfenstein stands on a rock formation in the upper Münstertal. As a hilltop castle at an elevation of approximately 895 meters, it once protected the surrounding silver ore mines.
History+
The construction of Scharfenstein Castle is attributed to the Lords of Staufen in the 12th century, who are documented as bailiffs of St. Trudpert Monastery in the Münstertal from 1211 onwards. The castle served to consolidate their rule and protect the access routes to the Münstertal. In 1267, it was first mentioned in a document as “castrum Scharphenstein.” Due to financial difficulties, the Lords of Staufen began selling parts of the castle and bailiwick rights from 1325 to St. Trudpert Monastery, and later also to the Habsburgs and the city of Freiburg.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://commons.wikimedia.org/wiki/File:Burg_Scharfenstein,_M%C3%BCnstertal_24.JPG
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: 47.8668, 7.8543