Sarah Winchester's 160‑room mansion in San Jose, built over 38 years starting in 1884, is famous for its maze‑like design with staircases to nowhere and doors that open onto walls. According to the estate's history and long‑standing legend, she continually added onto the house to appease spirits of those killed by Winchester rifles. The property is now a tourist attraction that markets itself as one of the world's most haunted houses.

Built in 1857, the Whaley House in Old Town San Diego is a preserved Greek Revival residence that has served as a family home, courthouse and theater. The museum bills itself as 'America's Most Haunted House' and offers daytime tours, evening ghost tours and after‑hours paranormal investigations. Visitors hear tales of the Whaley family and reported spirits, and many believe the site is haunted.