Pueblo Bonito (Spanish for beautiful town) is the largest and best-known great house in Chaco Culture National Historical Park, northern New Mexico. It was built by the Ancestral Puebloans who occupied the structure between AD 828 and 1126.
According to the National Park Service, "Pueblo Bonito is the most thoroughly investigated and celebrated cultural site in Chaco Canyon. Planned and constructed in stages between AD 850 to AD 1150 by ancestral Puebloan peoples, this was the center of the Chacoan world." Anthropologist Brian Fagan has said that "Pueblo Bonito is an archeological icon, as famous as England's Stonehenge, Mexico's Teotihuacan, or Peru's Machu Picchu."

In January 1941, a section of the canyon wall known as Threatening Rock, or tse biyaa anii'ahi (leaning rock gap) in Navajo, collapsed as a result of a rock fall, destroying some of the structure's rear wall and a number of rooms. The builders of Pueblo Bonito appear to have been well aware of this threat, but chose to build beneath the fractured stone anyway. The wall stood high and weighed approximately 30,000 tons; the Puebloans compensated by building structural reinforcements for the slab.

In 2009, traces of Mexican cacao from at least away were detected in pottery sherds at Pueblo Bonito. This was the first demonstration that the substance, important in rituals, had been brought into the area that became the United States at any time before the Spanish arrived around 1500. Cylindrical pottery jars, common in Central America, had previously been found there, but are rare. 111 jars have been found in Pueblo Bonito's 800 or so rooms.

Discovery
United States army Lt. James H. Simpson and his guide, Carravahal, from San Ysidro, New Mexico, discovered Chaco Canyon during an 1849 military expedition. They briefly examined eight large ruins in Chaco Canyon, and Carravahal gave them their Spanish names, including Pueblo Bonito, meaning beautiful village. Simpson later published the first description of Chaco Canyon in his military report, with drawings by expedition artist R. H. Kern.
Rancher Richard Wetherill and natural history student George H. Pepper from the American Museum of Natural History, began excavations at Pueblo Bonito in 1896 and ended in 1900. These excavations were financed by B. Talbot Hyde and Frederick E. Hyde, Jr. of New York City, who were philanthropists and collectors. During this time, the two men uncovered 190 rooms and photographed and mapped all major structures in the canyon.
Among the artifacts recovered by Pepper, eight wood flutes were found in a room in the northwestern part of Pueblo Bonito that Pepper designated as "Room 33". These flutes are in the style of the Anasazi flutes that are considered a predecessor to the Native American flute. The rituals at Pueblo Bonito were performed with cylindrical vessels, human effigy vessels, and ceramic incense burners. The Hydes donated the resulting large collection of artifacts to the American Museum of Natural History. After the excavation, Wetherill sought to gain personal control of parts of Chaco Canyon, including Pueblo Bonito, Chetro Ketl, and Pueblo Del Arroyo. He filed a homestead entry on these ruins, which was invalidated by the General Land Office in 1904 when the federal government took formal possession of these lands. Wetherill was required to stop his ongoing excavations on federal property, but continued to run a trading post at Chaco Canyon until his death in 1910.
Description
Pueblo Bonito is divided into two sections by a precisely aligned wall which runs north to south through the central plaza. A Great Kiva is situated on either side of the wall, creating a symmetrical pattern common to many of the Great Houses. In addition to the Great Kivas, over thirty other kivas or ceremonial structures have been found, many also associated with the large central courtyard. Interior living spaces were quite large by the standards of the Ancient Pueblo.
The site covers and incorporates approximately 800 rooms. In parts of the village, the tiered structure was four and five stories high. During later construction, some lower level rooms were filled with debris to better support the weight of the upper levels. The builder's use of core-and-veneer architecture and multi-story construction produced massive masonry walls as much as thick.





