Castellum, also called Hradek, is located at Strmy kopec (Steep Hill) above old Minarovsky mill in front of the Sulov gorge. It protected the entrance to Sulov thanks to its strategic location. Hradek was not inhabited, which means that it was used just in the time of danger. Its origin dates back to the 9th-11th century. It has become a natural heritage site in the 1967. This mysterious place has been declared a Natural monument in 2001. As a result, the rock formations, rare and endangered plants and animals, which occur in this area due to the specific climate may be protected.

zdroj: Vlastný výskum autorky textu M. Kerešovej.