NOTE: All visitors over age 18 must present a valid, government-issued ID to enter. The Chicago Fed is one of 12 regional Reserve Banks that--together with the Board of Governors--make up the Federal Reserve System, our nation's central bank. One of its many responsibilities is making sure that there is a sufficient supply of U.S. currency in good condition. They oversee the Seventh Federal Reserve District, which includes all of Iowa and parts of Illinois, Indiana, Wisconsin, and Michigan. The Chicago Fed building was designed by the firm of Graham, Anderson, Probst and White, which was responsible for such architectural landmarks as the Wrigley Building, the Shedd Aquarium, and the Merchandise Mart. The building's most recent renovation, started in 1986, upgraded its existing 820,000 square feet and included a 14-story addition. The first-floor Money Museum opened to visitors in 2001, with exhibits on currency, economics, and the role of the Federal Reserve.