Cliff Palace, Mesa Verde National Park, Colorado, USA
The Ancient Pueblo People or Anasazi were a prehistoric Native American culture in the Southwest of the USA. They are best known for the cliff dwellings constructed from adobe and sand stone.
The Cliff Palace is the largest cliff dwelling of the Anasazi culture. The "palace" was built into an alcove in a sandstone cliff. It's s 89 feet deep and 59 feet high (27 m x 18 m) and 288 feet (88 m) long. The structure has about 150 rooms, many of them were used as storage space. The Cliff Palace also has 23 kivas or ceremonial rooms.
The building was in use in the 10-11th century and was abandoned around 1300.