ancient roman bathing thermae in varna. fragments of columns. caldarium hot bath with

ancient antique archeology architecture atrium balkans balneum bath bathing baths black bolt building bulgaria caldarium city columns destination empire europe famous fragments furnace heating heritage historic history hot hypocaust moesia monument old palaestra pillar port public rimski roma roman rome ruin sea septimius severus sightseeing stone tepidarium termi thermae thermal tourism travel vacation varna vault wall