In May 1822 Lieutenant Ignacio Perez purchased the of San Bernardino Land Grant from the Mexican government. The 73,000-acre ranch covered the southeast corner of modern Arizona and extended far down into Sonora, Mexico. John H. Slaughter of Texas acquired some 65,000 acres of the old San Bernardino land grant from an heir of the original owner.

The historic museum and ranch was the home of cattle rancher John Slaughter. The main house contains many original family photographs and furnishings. Also on the ranch are a car shed, granary, barn and cook's ice and wash houses. Near the ranch is an early 1900s military outpost that was occupied during Mexican and Native American uprising.

The Geronimo Trail is accessible only under dry conditions. Picnic facilities are available. Allow two hours minimum for the tour.