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 turkey turkiye bogazici bosporus sea stone hills bricks ruin military coastline constantinople hisari marmara tower watchtowers water 1452 archaeological architecture europe sariyer destination famous ancient attraction cityscape landmark medieval old historic tourism summer sunny