What now remains of the castle dates from the XI-XIV century is preserved citadel that towers of 18 meters high.
It is built of crushed stone jointed with plaster and facade is decorated with baked bricks.
The architectural design of the tower consists of three parts: the eastern semi-cylindrical in shape, rectangular body in which they were at the accommodation and the west corridor, which was over a castle wall.
In the vicinity of the castle Bukelon takes place with the Battle of Adrianople (1205), when the troops of tsar Kaloyan defeated the knights of the Fourth Crusade, led by Baldwin of Flanders.
After the fall of the Second Bulgarian Empire (1396) under Ottoman rule, the fortress fell into disrepair and was abandoned.