San Jose, California, is home to one of the most peculiar structures ever built: the Winchester Mystery House, a 160-room Victorian mansion that includes 40 bedrooms, two ballrooms, 47 fireplaces, gold and silver chandeliers, parquet floors, and other high-end appointments. It features a number of architectural details that serve no purpose: doorways that open onto walls, labyrinthine hallways that lead nowhere, and stairways that rise only to a ceiling.