D1222 Chicago Skyline Lights at Night in Time-lapse

The city center of downtown Chicago, Illinois is known as The Loop. The urban metropolis, bordered by Lake Michigan and the Chicago River, has many of the tallest buildings in the world including the Sears Tower (Willis Tower). The city's architecture is famous for its mix of modern steel and glass office towers and classical structures, including those designed by architects Louis Sullivan, Daniel Burnham, John Wellborn Root and others. Also known as the Windy City, Chi-Town, Second City and the City of Big Shoulders, modern Chicago has become a major industrial hub, financial district and international travel destination.