(Source: Pinterest/Robin Castillo via Mary Castillo)
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10. Whaley House in San Diego, CA
Whaley House, San Diego is imposing in more ways than one: The two-story, Greek Revival-style mansion was built on a cemetery. Not only that, but it was also the site of a hanging. According to America's Most Haunted, it's actually the #1 most haunted house in the United States. Yikes.

Image via Pinterest | Mary Castillo.