Remains of ancient fortress walls, Nessebar, Bulgaria

mg2097 travel nessebar nessebur nesebar nesebur bulgaria bulgarian europe european fortress walls historic historical history culture building buildings architecture nobody ancient old stone stonework mediaeval medieval byzantine ruin ruins tower towers towering watchtower watchtowers turret turrets lookout blue sky fortresses fortified fortification fortifications ramparts dilapidated neglected disrepair crumbling neglect derelict grass wall walled walling landmark outdoors outdoor outside horizontal