Cagliatscha Castle, Castle ruin in Andeer, Grisons, Switzerland

Cagliatscha Castle is a castle ruin in Andeer in the Viamala region. Its southern wall still stands approximately 20 meters high, displaying large irregular stones with worked corners perched on a rocky spur above the Hinterrhein valley.

The castle was probably finished around 1266, when dendrochronology dates its larch beams; the Bishop of Chur had granted the region to the Freiherren von Vaz as a fief. After the Vaz line died out in 1338, the Counts of Werdenberg-Sargans inherited it. In 1451 the Count's campaign to force the valley back under his rule failed, and a fire then weakened the foundations, collapsing three of the four walls. The ruin was secured by the Burgenverein Graubünden in 1984/85.

The name comes from Romansh language and originally means "bad castle". The ruins sit in a region where Romansh is still spoken today and shapes the character of the valley.

The ruins are reachable via several hiking trails in the Viamala region, with different routes suited to varying fitness levels. The location offers views down the valley and is best visited during clear weather.

A dendrochronological study of a roof beam dated the castle's construction to 1266, making its roof the oldest original roof structure in Switzerland. The castle was probably built by the Panigad or Stainbrugg family, whose coat of arms is carved into the plaster on the third floor.