Hovenweep Castle, Square Tower group, built 1150-1350, Little Ruin Canyon, Hovenweep National Monument, Colorado, USA. The Square Tower group housed up to 500 people and includes towers, residential areas, kivas and storage rooms. This area has been settled by Native Americans from 6000 BC until the 14th century AD and currently houses the ruins of 6 Anasazi Puebloan villages from the 13th century. Picture by Manuel Cohen
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