Castle Rock of Kalavryta is known locally as Kastro of Orias (Castle of the Beautiful Lady). It is situated at an altitude of approximately 1,100 to 1,170 meters.
The medieval fortress was originally built in 1208 by the Frankish de Tournay family.
In March 1821, the first cannon was fired from this castle, marking the beginning of the Greek Revolution against the Ottoman Empire. Today, mostly ruins remain, including remnants of walls, water tanks, and two semicircular towers.