Equal parts Mexican hacienda, Native American cliff dwelling and psychedelic sand castle, the 18-room Mystery Castle was constructed in the 1930s and ’40s by Boyce Luther Gulley for his daughter Mary Lou. It’s an eccentric contraption of stone, recycled telegraph poles, adobe and whatever else he could scavenge, held together by a mix of sand, cement, calcium and goat’s milk. Mary Lou still lives in the house, but is now too frail to conduct the tours herself. Call ahead to make sure it’s open at all.