Hovenweep castle was built between A.D. 1200 and 1300. Hovenweep structures have quite a variety of shapes and sizes, including square and circular towers, D-shaped dwellings and many kivas (Puebloan ceremonial structures, usually circular). The masonry at is as skillful as it is beautiful. Even the cliff dwellings of Mesa Verde rarely exhibit such careful construction and attention to detail. Some structures built on irregular boulders remain standing after more than 700 years.
Many theories attempt to explain the use of the buildings at Hovenweep. The striking towers might have been celestial observatories, defensive structures, storage facilities, civil buildings, homes or any combination of the above. While archeologists have found that most towers were associated with kivas, their actual function remains a mystery. https://www.nps.gov/hove/learn/historyculture/index.htm
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