roumeli hissar castle near fatih sultan mehmet bridge on the bosphorus straight, istanbul, turkey

constantinople fortification architecture rumelihisari attraction historical bosphorus cityscape landscape touristic straight istanbul building exterior fortress heritage historic landmark rumelian roumeli ancient citadel culture defense history ottoman outdoor tourism turkish hissar castle sultan mehmet bridge turkey cruise europe famous museum orient rumeli strait travel fatih asian coast tower near city ship fort view wall old sea sky