Fortress near the village of Mezek

It is situated near the town of Slivengrad. It was built at about the end of 11th and the beginning of 12th c. under Aleksei I Komnin. Its walls encompass an area of 6.5 decares with the shape of an irregular tetragon. A Thracian tomb is located near the fortress, built during the 6th BC and constructed from 2-metre-long stone blocks. Unique ornaments and items were found here.