The remains of the Castle can be visited
Tschanuff Castle

West of the village of Ramosch in the Swiss canton of Graubünden stands the castle ruin of Tschanüff, once one of the most significant complexes in the Lower Engadine alongside Tarasp Castle. It is located on a spur of land at the edge of the Val Sinestra gorge.
History+
The origins of Tschanüff Castle date back to the 12th century, although the name “Tschanüff,” meaning “new house,” only appeared in the 16th century. Before that, it was simply known as Ramosch or Remüs. In 1256, Knight Nannes von Ramosch was granted permission to build a castle, but the oldest wall remains suggest an expansion of an already existing complex. The castle's history is marked by conflicts: in 1365, Duke Leopold of Austria mediated a dispute between the brothers Schwiker and Konrad von Ramosch, after which Schwiker killed his brother. Leopold then enfeoffed Ulrich von Matsch with the castle. After further disputes with the Bishop of Chur and the Lords of Matsch, which led to looting in 1395, the castle changed hands several times.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://www.wehrbauten.de
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: 46.8329, 10.3756