Mystery Hill
Some theories state that the formation was built by Native Americans. Others state that it was built by colonial settlers. William Goodwin purchased the land that the formations were on and came up with the theory that it was built by Vikings or Irish monks before Christopher Columbus entered America.
Ong's Hat in the Pine Barrens
Ong's Hat in the Pine Barrens of New Jersey dates back to the 17th century. The population of the town dwindled in the 20th century and remains a ghost town to this day. In the 1980s, a pamphlet was published claiming that Ong's Hat was home to a group of people who dabbled in interdimensional travel. The theory only grew with the introduction of the internet.