 Starosel is known for the abundance of ancient Neolithic and Thracian sites, with some finds dating as far back as the 5th-6th millennium BC.Evidence from 20th-century excavations reveals that the village burgeoned into an important and wealthy Thracian city in the 5th century BC.Among its main features are the underground temple, the largest of its kind in the Balkan Peninsula, built under the Chetinyova Mogila (tumulus) and a mausoleum.