The Minaret of Samarra is part of the Great Mosque of Samarra in Samarra, Iraq. The mosque is one of the largest in the world, and was built by the Abbasid caliph Al-Mutawakkil . The minaret was originally connected to the mosque by a bridge.
Diamond Head, Oahu, Hawaii is the name of a volcanic tuff cone on the Hawaiian island of O'ahu. Its English name was given by British sailors in the century, who mistook calcite crystals on the adjacent beach for diamonds. Hawaii is the state.