17th century architecture Argolis battlements castle defence defense elements fort fortress Greece historical landmark Morea nafplio old Palamidi Peloponnese power ramparts stone stronghold venetian walls arch hill hilltop Remains ruins ancient blocks capstone entrance Golan Heights Israel Mivtzar Nimrod Nimrod Nimrud Qal'at Namrud wall room strong hills lookout mountains sentry Built Structure cathedral city cloud europe Famous Place. Peter And Paul's Fortress Russia Saint Petersburg sky Traditional Culture travel travel destinations urban scene chimneys Cornish cornwall England english Great Britain Michael mount national trust parapet saint St. Michael's Mount stacks