Share Your Obscure Historical Landmarks, Win James Loewen's Book

In the meantime, we have a copy of James Loewen's Lies Across America: What Our Historic Sites Get Wrong to give away, so let's do this: tell us about the historical landmarks in your general vicinity. The most obscure historic site wins the book. We'll also give away a mental_floss t-shirt to another submission we find particularly enjoyable.
We'll announce the winners early next week. I'm looking forward to adding a few more sites to my 'Must Visit (But Probably Won't)' list.
[Image courtesy of Jim Albano's Real Estate Blog.]