In October, 1890 James Scotford unearthed some relics while digging postholes for a fence in Montcalm County, Michigan. The relics appeared to demonstrate the prior existence of a Near Eastern culture in ancient America. They were eventually debunked as frauds, though not before attracting a lot of attention and stirring up lots of controversy. Now the relics are on display again. The Michigan Historical Museum has a special exhibit devoted to them titled 'Digging Up Controversy: The Michigan Relics.'
Much of the exhibit can be viewed online. Definitely worth checking out.