Built for a daughter who longed for a castle more permanent than those built in the sand at the beach, Mystery Castle is a wondrous work of folk-art architecture. Boyce Luther Gulley, who had come to Arizona in hopes of curing his tuberculosis, constructed the castle during the 1930s and early 1940s using stones from the property. The resulting 18-room fantasy has 13 fireplaces, parapets, and many other unusual touches.