ancient wall in thessaloniki, greece

thessaloniki aegean sea thermaic gulf walls byzantine wall greece landmark ancient ruins thessalonica saloniki salonika salonica greek city urban hellenic republic macedonia travel tourism tourist attraction destination building architecture famous sightseeing historic historical history old ruin middle ages medieval mediaeval eastern mediterranean water seascape seaside seashore coast coastline shore macedonian ship ships remains town skyline horizon vacation tower bay sky river ocean panorama beach