Hovenweep National Monument stradles the Colorado-Utah border west of Cortez, Colorado, United States. President Warren G. Harding proclaimed Hovenweep a National Monument on March 2, 1923. The Monument consists of six clusters of Native American ruins. Four of these are in Colorado: Holly Canyon, Hackberry Canyon, Cutthroat Castle and Goodman Point. In Utah, the two sets of ruins are known as Square Tower and Cajon. The modest Monument headquarters is located at Square Tower Group between Pleasant View, Colorado and Hatch Trading Post, Utah.