On March 11th 1958, the US government accidentally dropped a nuclear bomb on Mars Bluff, South Carolina. While the nuclear warhead didn't go off, the TNT detonation that triggers the nuclear chain reaction did, and it left a crater 35 feet deep and 75 feet across.
The short version of this story is that some guy has a piece of that bomb about the size of a man's hand, and he is selling it on eBay.
I think this is going to be a huge auction... with 6 days remaining on the auction, there has already been 25 bids with the high bid at $4,550 so far. If you want to check it out, you can do so here.