The document describes various indigenous structures and settlements across North and South America from prehistoric times to the 15th century CE. It details architectural features of mound-building cultures like the Natchez and Mississippian peoples, pueblos of the Ancestral Puebloans, and earthworks like the Serpent Mound. Mesoamerican structures discussed include temples and ceremonial centers of cultures like the Olmec, Maya, Teotihuacan, Toltec, and Aztec. In South America, it outlines the precise stonework and mountainous settlements of the Inca, including Machu Picchu and Tiwanaku's Gate of the Sun monument.