Ghost Ranch, a Presbyterian education and retreat center near Abiquiu, New Mexico, received its eerie name from the many legends of ghosts and hangings that permeate the area's history. In the mid 18th Century, the King of Spain gave Pedro Martin Serrano a land grant that included the 21,000 acres that would later become Ghost Ranch. The Presbyterian Church received Ghost Ranch in 1955 and turned it into a retreat center. The center's logo, an ox skull, is based on a drawing by artist Georgia O'Keefe, who visited Ghost Ranch yearly for almost fifty summers during the 20th Century, focusing much of her artwork on the local scenery. Ghost Ranch is also known for its abundance of Triassic era fossils, including the Ceolophysis, which was discovered at Ghost Ranch in 1947. Several popular films have been shot at Ghost Ranch, including City Slickers, 3:10 to Yuma, and the opening scenes of Indiana Jones and the Kingdom of the Crystal Skull.