A significant part of Bulgaria's hydropower resources are located in the western areas of the range. There are a number of hydro-cascades and dams used for electricity production, irrigation and as tourist destinations. In Greece there are also the HPPs of Thisavros and Platanovrysi. The Rhodopes have a rich cultural heritage including ancient Thracian sites such as Perperikon, Tatul and Belintash, and medieval castles, churches, monasteries and picturesque villages with traditional Bulgarian architecture from the 18th and 19th centuries.