Chetro Ketl is a large and complex archaeological site located in Chaco Canyon, New Mexico, representing one of the most significant examples of Ancestral Puebloan architecture and society. This structure, built in the 11th century, showcases the advanced building techniques, social organization, and cultural practices of the Ancestral Puebloans, also known as the Anasazi. Chetro Ketl's construction reflects their ability to adapt to the environment and highlights the importance of trade, agriculture, and communal living in their society.