The most notable achievement of the ancestral Puebloans was their architectural feats, particularly the construction of elaborate and intricate cliff dwellings and other stone structures such as the famous Pueblo Bonito in Chaco Canyon and Mesa Verde in Colorado. These structures were built using stone tools and without the use of mortar, showcasing their engineering and building skills. Their ability to adapt to their environment and create impressive, multi-story structures in the harsh desert landscape is considered a remarkable accomplishment.
