The Davis brothers built Redstone Castle in 1890 as a model home for an elite development called Manitou Terrace Estates on Iron Mountain. They published ads to attract the wealthy and established colorful billboards in the east of Garden of the Gods, Pikes Peak and Rainbow Falls. None of the lots sold, however, reputedly because buyers learned that the land was haunted. Some believed this was because some, but not all, of the graves had been moved from the hillside to the Crystal Valley Cemetery.