An early pithouse is a type of semi-subterranean dwelling that was primarily used by the Mogollon and Mimbres cultures in what is now the Southwestern United States. These structures were characterized by their circular or oval shape, partially dug into the ground to provide insulation from extreme weather, and constructed using natural materials like wood, stone, and adobe. They reflect the adaptive strategies of these cultures to their environment and are significant in understanding their architectural and social development.