The ancient Americans did remarkable pottery. Some very little of this decorative pottery has survived. The Anasazi did more than build cliff structures. I have attached a link with pictures of neat pottery from them. The bown qualifies as a major artistic work to be because it is so beautiful.
Some of the most stunning architectural feats of the Americas pre-1300 were the Anasazi cliff dwellings of the Four Corners area. Among the best know are those of Mesa Verde in Colorado. They take advantage of the natural caves in the sandstone of the mesa to construct dwellings safe from invasion and the worst elements of the weather. The walls were normally constructed of masonry. Being built from the same sandstone as the cliffs in which they were embedded, they blend holistically into their environment. Their visual drama, especially as seen in the photographs of Ansel Adams, is due to their being so seamlessly integrated into the soaring cliffs of the southwest.