875 North Michigan Avenue

875 North Michigan Avenue, formerly the John Hancock Center, has been gracing Chicago's skyline since 1969. An architectural marvel, this 100-story structural expressionist building is among the world's tallest buildings. Its X-braced glass facade is crowned with a band of changing lights that can be seen from across the city at night. A trip to the 94th floor observatory reveals a breathtaking picture of Lake Michigan and the Chicago skyline. Talking telescopes provide information on the sights below, while an open-air skywalk promises a chance to experience why Chicago is called the Windy City from 1,000 feet (304 meters) up. Virtual tours of popular Chicago sights are available here. One of the city's major attractions, 875 North Michigan Avenue is truly iconic.