remains of the builings in the ancient roman city of diokletianopolis, town of hisarya, bulgaria

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