Fodor's Expert Review Hovenweep National Monument
Straddling the Colorado–Utah border, this monument is known for distinctive square, oval, round, and D-shape towers that were engineering marvels when they were built around AD 1200. The buildings are spread throughout a series of ancient villages, once home to 2,500 people. The visitor center is on the Utah side of the monument. Per rangers, don't attempt to use your GPS to find Hovenweep. Most devices will take you either over rough dirt roads or to more remote parts of the monument.