sunset view of ruins of fortifications of ancient roman city of diocletianopolis, hisarya, plovdiv region, bulgaria

ancient archeological archeology architecture brick bulgaria byzantine city destinations diocletianopolis diokletian diokletianopolis europe fortification fortifications fortress gora hisar hisaria hisarya hissar hissaria hissarya historical history landmark mineral mountain outdoor park plovdiv region remains resort roman ruins sight sightseeing spa sredna stone structure sunset thrace tourism touristic town vacation view wall water