Ghost Ranch is a 21,000-acre (85 km2) retreat and education center run by the Presbyterian Church (U.S.A.), located close to the village of Abiquiu in Rio Arriba County, New Mexico. The last private owner of the Ghost Ranch was Arthur Newton Pack, who donated the ranch to the Presbyterian Church. Arthur Pack was also the publisher of Nature magazine and opened the Ghost Ranch Lodge in Tucson, Arizona, and contributed to the creation of the Arizona Sonora Desert Museum.