The Thracian cult complex by Starosel village was discovered in 2000 and immediately became a sensation. It is interesting that the discovery is not a traditional tomb, but a sort of tomb/temple. It is assumed that it is most probably the tomb of King Sitalkes. In addition to the burial, this sanctuary was also the location of the customary rites related to the Thracian cult and beliefs.
The tomb/temple consists of two chambers – the first is square and the one after it is round. An impressive rock stairway leads to them. Outside the sanctuary is surrounded by a supporting wall called krepis. The sanctuary itself is built on a natural mound and at this point constitutes the largest preserved Thracian royal complex with a temple/mausoleum in South Eastern Europe. The finesse of architecture and the view of the entire Valley of Thracian Kings revealed from the location doubtless indicate that Starosel is a cult complex related to the royal institution. Specialists date part of the finds from the end of the 5th and the beginning of the 4th century before Christ.