The first U.S. mint was built in Philadelphia at 16th and Spring Garden streets in 1792, when the Bank of North America adopted dollars and cents instead of shillings and pence as standard currency; the current mint was built in 1971. During a self-guided tour you can see blank disks being melted, cast, and pressed into coins, which are then inspected, counted, and bagged. The visitors' gallery has an exhibition of medals from the nation's wars, including the Medal of Honor, the Purple Heart, and the Bronze Star. Seven Tiffany glass tile mosaics depict coin making in ancient Rome. A shop in the lobby sells special coins and medals—in mint condition.