½ Dollar (Apollo 11 50th Anniversary)

The Apollo 11 Half Dollar — A Coin Shaped Like a Space Helmet

Almost every coin you have ever held is flat. This one is not. To honor 50 years since the first walk on the Moon, the Mint pressed a half dollar into a curve — a bootprint sunk into the dish on one side, the bulge of an astronaut's visor swelling out the other.