A massive, hulking building that looks like an Italian Renaissance fortress, the main public library for the city of Chicago is the largest public library in the world. Named for the city's first and only African-American mayor, who died of a heart attack in 1987 at the beginning of his second term in office, the building fills an entire city block at State Street and Congress Parkway. The interior design has been criticized for being somewhat cold (you have to go up a few floors before you even see any books), but the stunning 52-foot glass-domed winter garden on the top floor is worth a visit. On the second floor is another treasure: the vast Thomas Hughes Children's Library, which makes an excellent resting spot for families with young children. The library offers an interesting array of events and art exhibitions worth checking out. A 385-seat auditorium is the setting for a unique mix of dance and music performances, author talks, and children's programs. Allow a half-hour.