Tyuonyi, the most interesting archaeological area within Bandelier National Monument (New Mexico), named for the archaeologist Adolph F. Bandelier, who was active at the end of the 19th century in the Southwest. The circular pueblo at one time encompassed perhaps 400 rooms and three kivas (only one of which has been excavated). Some of the buildings were two stories high. Between 1100 and 1550, the population was approximately 100.