One of Louis Sullivan’s best-known buildings, the Auditorium Building in Chicago was completed in 1889. At the time of its completion, the Auditorium Building was the largest building in the United States and the tallest building in Chicago. In 1891, the Chicago Orchestra debuted and called the Auditorium home until 1904. During the Great Depression, the Auditorium actually had to close and remained closed until 1941 when it was taken over by the city of Chicago to be used as a World War II center. In 1967, the Auditorium reopened and served as a rock venue for the next decade or so. In 1975, the USDI declared it a National Historic Landmark. Today, the Auditorium serves as an entertainment venue, with the NFL holding the 2015 NFL draft there.