Do you know... The most expensive coin in the world was sold for more than $7 million.

The 1933 Double Eagle was a $20 U.S. coin made of gold that never went into circulation. A few of the coins were made, but most were destroyed—save for nine that were presumed stolen by U.S. mint workers. After years circulating the globe and falling into the hands of a few notable owners—including the king of Egypt—one of the coins was auctioned off at Sotheby's in 2002 for a stunning $7,590,020. That made it the most expensive coin ever sold at auction.