Kiz-Kala fortress, dating from the 6th century AD, Old Merv, UNESCO World Heritage Site, Turkmenia, Turkmenistan, Central Asia, Asia

A triangular lunette at the Castillo del Morro, a fortess at the entrance to the Bay of Santiago, UNESCO World Heritage Site, 10 km southwest of Santiago de Cuba, Cuba, West Indies, Central America

Cuban coastline and the Castillo del Morro, a fortess at the entrance to the Bay of Santiago, UNESCO World Heritage Site, 10 km southwest of Santiago de Cuba, Cuba, West Indies, Central America

A view of the Gonio Fortess outside Batumi, Georgia, Eurasia

Syria, Haura, Bosra Ancient Roman Capital Of The Arabia Province, Child On A Bike Passing By The Fortess Walls, At Back The Theater