Mesa Verde National Park in the context of "Ancestral Puebloans"

The Four Corners is a region of the Southwestern United States consisting of the southwestern corner of Colorado, southeastern corner of Utah, northeastern corner of Arizona, and northwestern corner of New Mexico. Most of the Four Corners region belongs to semi-autonomous Native American nations, the largest of which is the Navajo Nation, followed by Hopi, Ute, and Zuni tribal reserves and nations. The Four Corners region is part of a larger region known as the Colorado Plateau and is mostly rural, rugged, and arid. The largest state in the region is New Mexico, which is the fifth-largest state of the fifty states.

The Four Corners area is named after the quadripoint at the intersection of approximately 37° north latitude with 109° 03′ west longitude, where the boundaries of the four states meet, and is marked by the Four Corners Monument. It is the only location in the United States where four states meet. In addition to the monument, commonly visited areas within Four Corners include Monument Valley, Mesa Verde National Park, Chaco Canyon, Canyons of the Ancients National Monument and Canyon de Chelly National Monument. The most populous city in the Four Corners region is Farmington, New Mexico, followed by Durango, Colorado.

The United Nations Educational, Scientific and Cultural Organization (UNESCO) World Heritage Sites are places of importance to cultural or natural heritage as described in the UNESCO World Heritage Convention, established in 1972. Cultural heritage consists of monuments (such as architectural works, monumental sculptures, or inscriptions), groups of buildings, and sites (including archaeological sites). Natural features (consisting of physical and biological formations), geological and physiographical formations (including habitats of threatened species of animals and plants), and natural sites which are important from the point of view of science, conservation, or natural beauty, are defined as natural heritage. The United States accepted the convention on December 7, 1973. There are 26 World Heritage Sites in the United States, with a further 17 on the tentative list.

The first sites in the United States added to the list were Mesa Verde National Park and Yellowstone National Park, both at the second session of the World Heritage Committee, held in Washington, D.C., in 1978. The most recent site listed is the Historic Moravian Bethlehem District, as a part of the transnational site Moravian Church Settlements, shared with Denmark, Germany, and the United Kingdom. The 26 sites are located in 22 states and two territories. Arizona, California, Hawaii, Illinois, Montana, New Mexico, New York, and Pennsylvania each contain multiple sites (with the 20th-Century Architecture of Frank Lloyd Wright listing spread across six states). There are also two transboundary sites that are shared with Canada. Of the 26 sites, 13 are cultural, 12 are natural, and one, Papahānaumokuākea, is mixed, listed for both cultural and natural properties. One site is currently listed as endangered: Everglades National Park was listed in 2010 due to deterioration of its aquatic ecosystems. The site had also been listed as endangered between 1993 and 2007. Yellowstone National Park was listed as endangered between 1995 and 2003 because of planned mining operations. The United States has served as a member of the World Heritage Committee five times, 1976–1983, 1987–1993, 1993–1999, 1999–2001, and 2005–2009.

Cliff Palace is the largest cliff dwelling in North America. The structure built by the Ancestral Puebloans is located in Mesa Verde National Park in their former homeland region. The cliff dwelling and park are in Montezuma County, in the southwestern corner of Colorado, Southwestern United States.

Montezuma County is a county located in the southwest corner of the U.S. state of Colorado. As of the 2020 census, the population was 25,849. The county seat is Cortez. Montezuma County contains many archaeologically significant Amerindian structures, which notably can be found in Mesa Verde National Park, Canyons of the Ancients National Monument, Yucca House National Monument, and Hovenweep National Monument. Montezuma County is also home to most of the Ute Mountain Indian Reservation, home of the Weeminuche Band of the Ute Nation, known as the Ute Mountain Ute Tribe, with its headquarters at Towaoc.

A kiva (also estufa) is a space used by Puebloans for rites and political meetings, many of them associated with the kachina belief system. Among the modern Hopi and most other Pueblo peoples, "kiva" means a large room that is circular and underground, and used for spiritual ceremonies and a place of worship.

Similar subterranean rooms are found among ruins in the Southwestern United States, indicating uses by the ancient peoples of the region including the ancestral Puebloans, the Mogollon, and the Hohokam. Those used by the ancient Pueblos of the Pueblo I Period and following, designated by the Pecos Classification system developed by archaeologists, were usually round and evolved from simpler pit-houses. For the Ancestral Puebloans, these rooms are believed to have had a variety of functions, including domestic residence along with social and ceremonial purposes.