Aztec Ruins National Monument was established in 1923 by presidential proclamation in recognition of a "ruin of great antiquity and historical interest" and "with a view to the preservation of said ruin for the enlightenment and culture of the Nation." Its boundaries were increased over the years to its present authorized boundaries of approximately 320 acres. All the lands administered by the Park--about 257 acres--fall within the City of Aztec.
