sozopol, bulgaria - black sea coastline with ancient city on the cliffs

apollonia black sea bulgaria burgas eastern europe sozopol ancient civilization beach bulgarian culture calm cityscape cliff coastline environment harbor history horizontal idyllic island journey landscape lighthouse multi colored old town outdoors panoramic peninsula poolside relax resort rocks rooftop seascape seaside summer sun sunlight sunny tranquil tropic turquoise vacation villa water waves city cliffs bulgaria located bulgaria's historic charm beaches cultural festivals