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

rumelihisari bogazkesen castle fort istanbul mountain bosphorus strait hill sultan mehmet ottoman rumelian citadel roumeli hissar trees fortress turkey turkiye bogazici bosporus sea ruin rumeli hisari coastline constantinople tower watchtowers architecture sariyer dawn sunrise daybreak dusk europe cityscape landmark historic tourism 1452 summer 2022