rumelihisari, or bogazkesen castle, at the hills of the european side of bosphorus strait, istanbul, turkey

rumelihisari bogazkesen castle fort istanbul trees mountain bosphorus strait ottoman citadel fortress boat ship turkey turkiye bogazici bosporus sea stone sky hills bricks ruin coast cumulus fortification coastline constantinople hisari marmara tower watchtowers water 1452 sariyer destination ancient attraction landmark medieval historic tourism summer city landscape