Claim: Ghost Ranch, a National Natural Landmark since 1976, was first settled by cattle rustlers known as the McNaldo brothers.
Evidence: Ghost Ranch is a 21,000-acre (85 km) retreat and education center located close to the village of Abiquiú in Rio Arriba County in north central New Mexico, United States. In 1976, Ghost Ranch was designated as a National Natural Landmark by the National Park Service. The canyon was first inhabited by the Archuleta brothers, cattle rustlers who enjoyed the coverage and invisibility that the canyon provided as well as their ability to see for miles down the valley.