Haldenstein Castle stands on a wooded spur of the Calanda massif about five kilometres north of Chur, overlooking the Rhine valley at a bend in the river. The castle dates from the 12th century and was the seat of the lords of Haldenstein, a minor dynasty that controlled the Rhine crossings in this section of the valley for several hundred years. The main tower and parts of the outer wall survive in good condition; the interior is ruined but accessible.
The walk up from the village of Haldenstein takes about 20 minutes on a well-marked forest path, rising steeply through oak and chestnut woodland before emerging at the castle terrace. The view from here — south toward Chur, north toward the broadening valley, and east toward the Calanda peaks — is one of the best viewpoints in the region and a favourite with local walkers.
Haldenstein village is easily reached from Chur by bicycle along the Rhine cycle path, or by local bus. The castle itself is unguarded and always open; there is no entry charge.