The castle was built near the, now abandoned and vanished, Walser village of Fidaz near Flims.
 It was built on a rocky spire with sheer cliffs on the north and east sides.
 Very little is known about the construction history and layout of the castle.
 However, there were two semi-circular ring wall that wrapped around the east, north and north-west sides of the peak with the inner one built first followed by the outer later.
 The walls connected at least three buildings.
 The central and eastern building were probably residences.
 In the center of the half-circle is a 5.7 meters (19 ft) deep cistern.
 On the southern side of the castle is a smaller rocky peak that stands about 8 m (26 ft) above the castle and has a flat top that is about 10 m × 30 m (33 ft × 98 ft).
 No stone ruins have been found on the small peak, so it was probably topped with one or more wooden buildings.

A stone wall which was probably part of the outer fortifications is still visible at the foot of the spire.
The castle was built near the, now abandoned and vanished, Walser village of Fidaz near Flims.  It was built on a rocky spire with sheer cliffs on the north and east sides.  Very little is known about the construction history and layout of the castle.  However, there were two semi-circular ring wall that wrapped around the east, north and north-west sides of the peak with the inner one built first followed by the outer later.  The walls connected at least three buildings.  The central and eastern building were probably residences.  In the center of the half-circle is a 5.7 meters (19 ft) deep cistern.  On the southern side of the castle is a smaller rocky peak that stands about 8 m (26 ft) above the castle and has a flat top that is about 10 m × 30 m (33 ft × 98 ft).  No stone ruins have been found on the small peak, so it was probably topped with one or more wooden buildings.
A stone wall which was probably part of the outer fortifications is still visible at the foot of the spire.
Belmont Castle, Graubünden