The remains of the fortress can be visited
Matochina (Маточина) Fortress

The Matochina Fortress, also known as Bukelon, is a historic defensive structure on a plateau northeast of the village of Matochina in Bulgaria. It is notable for its well-preserved keep.
History+
Matochina Fortress was mentioned in ancient accounts of the Battle of Adrianople in 378. The 18-meter-high keep, still visible today, was constructed between the 12th and 14th centuries.
Location+
Matochina Fortress is located in the village of Matochina, which belongs to the Swilengrad district in the Chaskowo region of Bulgaria. It stands at an elevation of approximately 196 meters above sea level.
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Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://en.wikipedia.org/wiki/File:Bukelon_Fortress_Matochina_Bulgaria.jpg
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 41.8537, 26.5469