The remains of the Castle can be visited
New-Süns Castle (Ruin) (Paspels)

The ruin of Neu-Süns, also known as Canova, is on a wooded hill between the villages of Almens and Paspels in the Swiss canton of Graubünden.
History+
The origins of Neu-Süns Castle are presumed to be in the second half of the 13th century, which can be inferred from the round shape of the residential tower and other architectural features. It was first documented in 1392 as “Nüwen Sünns,” indicating a more recent foundation by the Lords of Vaz in Domleschg. The name “Canova” (new house) is likely a later Romanization. The castle served as the seat for the ministerials of the Barons of Vaz. After the death of the last Vaz, Donat von Vaz, in 1338, the complex passed to the Counts of Werdenberg. Towards the end of the 14th century, Anna von Rhäzüns, married to Johann von Werdenberg-Sargans, resided in the castle. An arbitration award from 1392 granted her the right to live at Neu-Süns, including the renovation of living quarters.
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: 46.7441, 9.4477