5) 2007 Queen Elizabeth II Million Dollar Coin

The 2007 Queen Elizabeth II Million Dollar Coin is a large, 21-inch diameter, 220-pound coin struck from the most refined gold available. This one-of-a-kind coin sold for $4 million.

The original remains with the Canadian Mint, but 5 others were made and sold around the world. In 2017 one of the copies was stolen from the Bode Museumin Berlin, Germany.

Via Flickr