Casa Grande Ruins National Monument
Coolidge, Arizona
The four-story Hohokam great house under its steel shelter at Coolidge, Arizona, a fourteenth-century building whose purpose is argued and whose preservation began in the nineteenth century.
Casa Grande is the great house of the Hohokam: a four-story structure of caliche, built in the fourteenth century by a desert-farming people whose canal systems made the Sonoran Desert bloom, and abandoned within a few generations, for reasons the archaeology has not settled. The building's survival, under a 1932 steel shelter designed by the same architect later famous for the Golden Gate Bridge approach, made it the first prehistoric site protected by the United States, its national monument designation predating the Antiquities Act's better-known descendants.
The Hohokam's descendants include the O'odham nations, and the monument's interpretation carries that continuity. The great house's purpose, astronomical observation, storage, or ceremonial center, remains argued, and the park keeps the question open.
Visiting
The National Park Service's Casa Grande page carries access and the shelter's visiting rules; the park is fee-free per current listings.
Photo: [Wikimedia Commons](https://commons.wikimedia.org/wiki/Category:Casa_Grande_Ruins_National_Monument), CC BY-SA 4.0.
Associated traditions & practices
Visitor stories