New Mexico Next Aztec Ruins National Monument  

    A series of rooms connected by small doorways. It is believed that Ancestral Pueblos from Chaco Canyon (to the south) began construction about 1110. It was abandoned for about 25 years around 1200 and then occupied and reconstructed by people from Mesa Verde (to the north). It was permantly abandoned for the second time, for unknown reasons, around 1300.