observation deck with glass floor and metal railing over foundation ruins of ancient buildings in the kizkalesi castle

112021observation ancient arch architecture background bastion blue buildings byzantine castle citadel city coastline courtyard deck empire empty floor fortress foundation glass heritage history holiday inner interior island kalesi kizkalesi kizkalesiturkeyoctober landmark list medieval mediterranean mersin metal nobody observation old osman panoramic railing remains roman ruin ruins sea sight stone tourism tourist tower town travel turkey turkish view wall water