Chicago is the largest city in the U.S. state of Illinois and the third most populous city in the United States, with around 2.7 million residents. Its metropolitan area, sometimes called "Chicagoland," is the third largest in the United States, with an estimated 9.8 million people in the states of Illinois, Wisconsin and Indiana. Chicago is the county seat of Cook County,the second most populous county in the United States.
In 1885, the first steel-framed high-rise building, the Home Insurance Building, rose in Chicago, ushering in the skyscraper era. Today, Chicago's skyline is among the world's tallest and most dense. The nation's two tallest buildings are both located in Chicago; Willis Tower (formerly Sears Tower), and Trump International Hotel and Tower. The Loop's historic buildings include the Chicago Board of Trade Building, the Fine Arts Building, 35 East Wacker, and the Chicago Building, 860-880 Lake Shore Drive Apartments by Mies van der Rohe. Many other architects have left their impression on the Chicago skyline such as Daniel Burnham, Louis Sullivan, Charles B. Atwood, John Root, and Helmut Jahn. The Merchandise Mart, once first on the list of largest buildings in the world, and still listed as 20th with its own ZIP code, stands near the junction of the North and South branches of the Chicago River. Presently, the four tallest buildings in the city are Willis Tower (formerly the Sears Tower),Trump International Hotel and Tower, the Aon Center (previously the Standard Oil Building), and the John Hancock Center.Industrial districts, such as on the South Side, the areas along the Chicago Sanitary and Ship Canal, Chicago Southland, andNorthwest Indiana are clustered.
This space that will serve to place the skyline of Chicago