Commemorative coins help raise money for various causes
From time to time, Congress authorizes the U.S. Mint to make a limited production run of special commemorative coins. These coins are still legal currency, but they’re generally not intended for general circulation.
But by selling commemorative coins to collectors, the U.S. Mint has raised over $500 million to fund various museums, monuments and other programs. Not to mention, some coins are considered extremely valuable.