Hovenweep National Monument includes five prehistoric, Puebloan-era villages located on the Cajon mesa along the Utah-Colorado border.  The standing architecture typical of the area was built about 800 years ago by ancestors of today's Puebloan people.   Hovenweep is noted for its solitude and undeveloped, natural character.  The Square Tower Unit is the monument's primary contact facility with ranger-led tours, a visitor center and campground.  Outlying units include Holly, Horseshoe, Hackberry, Cutthroat Castle and Cajon.  Land surrounding Hovenweep belongs to the Navajo Nation, Bureau of Land Management, State of Utah, and private landowners. Text from U.S National Park Service Hovenweep Website