Crumbled House is an Ancestral Puebloan site in northwestern New Mexico on the far western edge of Chaco influence, occupied mainly from about 1100 to 1250 AD, with some use possibly continuing to about 1300. Built around a tabletop mesa with stair-linked segments, it is especially notable for its defensive plan, including mesa-top towers, enclosing walls, and an eastern moat. The settlement included large numbers of rooms and kivas, used timber from the nearby Chuska Mountains, and drew stone from surrounding slopes. Although connected to the Chacoan world, its masonry, kivas, pottery, and stone materials show especially strong ties to Mesa Verde traditions and the local Chuska landscape.