The walls are 8 meters high and 2 meters thick and are about 550 meters long.
The fortress is probably built in 12th century. In the eastern part of the fortress are remains of a church. The best preserved part of the Byalgrad fortress is the inner tower – the “donzhon” as its walls are 9 meters high.
It is believed that the tower is renovated after Bulgaria fell under Turkish rule and a Turkish feudal lived there .
The name of the fortress comes from the white colour of the limestone of which the walls and the buildings are built.
The fortress is situated 2 km southeast from the village of Gugutka and 20 km southwest from the town of Ivaylovgrad.