Thracian dolmens are one of the most important archeological findings from ancient Thrace in Elhovo area. Dolmens are the oldest Thracian tombs. They have rock structure build from few natural stones. Thracian people used them to bury seniors of the tribal aristocracy. Similar megalithic structures are preserved in Western Europe and the Caucasus. In the Balkan Peninsula they are found only in the Eastern Rhodopes, Sakar and Strandja. The larger of the two dolmens near the village of Golyam Dervent was investigated in 2007. It is consists of two cameras and dromos (entrance) and dated from 9th - 8th century BC.
extends on an area of 467.47 hectares next to the park zone of the town of Elhovo. You can easily reach it with a short walk from the center of Elhovo to the park area. After crossing a bridge over the river of Tundzha you will find the beginning of the natural trail which is red marked and pass through the most important and scenic spots in the reserve. This reserve is created to preserve the only natural habitat of the Phasianus colchicus in Europe. Today you can't see wild pheasant to the reserve because of the stronger animals that don't leave them alive but there is a pheasant farm where people look after the birds so they still habit the reserve.