Beglik Tash is a prehistoric rock sanctuary in the Strandzha hills, about five kilometres north of Primorsko. The site consists of massive granite boulders — some natural, some shaped and arranged by human hands — that form a ritual complex used by the ancient Thracians from around 1500 BCE. Circular stone alignments, carved channels, and openings aligned to the summer solstice sunrise suggest this was a centre of astronomical observation and religious ceremony.
The setting is atmospheric: the boulders sit in a pine forest above a stream, quiet and largely unvisited outside summer weekends. A small path leads from the car park through the trees to the main rocks. There is no admission charge, though a small parking fee is collected in summer. The site is easy to combine with a beach day in Primorsko.