Mesa Verdean communities flourished through the mid-Pueblo III Era, when designers built large, multi-story structures, and craftsmen embellished ceramic with progressively complex designs. Elements built while in this period have been defined as "among the world's greatest archaeological treasures". Pueblo III masonry structures were generally populated for roughly fifty years, Structural innovative developments such as towers and multi-walled buildings also show up during the Pueblo III Era. Mesa Verde's inhabitants continued to be quite constant during the 12th century drought. At begin of the 13th century, roughly 22,000 people lived there. The area found average inhabitants improves during the next decades, and extraordinary ones from
