Chicago is also known as City of Chicago or Windy City, is the third-most populous city in the United States. With over 2.7 million residents, it is the most populous city in the state of Illinois and the Midwestern United States, Chicago was incorporated as a city in 1837, near a portage between the Great Lakes and the Mississippi River watershed. The city is an international commerce, industry, technology, telecommunications, and transportation, O'Hare International Airport is the second busiest airport in the world when measured by aircraft traffic, the zone also has the biggest number of U.S. highways and rail road freight. In 2012, Chicago was listed as an alpha global city by the Globalization and World Cities Research Network, and ranked seventh in the world in the 2014 Global Cities Index. The city has one of the world's largest and most diversified economies with no single industry employing more than 14% of the workforce.
In 2016, Chicago hosted over 52 million international and domestic visitors, a new record for the city making it one of the top visited cities in the nation. Chicago has the 3rd largest gross metropolitan product in the United States about $630.3 billion conferring to 2014–2016 estimates. Chicago’s culture includes the visual arts, novels, film, theater, especially improvisational comedy, and music, particularly jazz, blues, soul and house music. There are many colleges and universities in the Chicago area among these, Northwestern University, the University of Chicago, and the University of Illinois at Chicago are categorized as highest research doctoral universities. Chicago also has professional sports teams in each of the major professional leagues. Chicago was named the fourth-most important business center in the world in the MasterCard Worldwide Centers of Commerce Index. Chicago is a major world financial center, with the second-largest central business district in the United States. In 2014, Chicago attracted 50.17 million domestic leisure travelers, 11.09 million domestic business travelers and 1.308 million overseas visitors. The city formally exposed the Museum Campus, a 10-acre (4.0 ha) lakefront park, surrounding three of the city's main museums, each of which is of national importance, the Adler Planetarium & Astronomy Museum, the Field Museum of Natural History, and the Shedd Aquarium. The University of Chicago Oriental Institute has an extensive collection of ancient Egyptian and Near Eastern archaeological artifacts. Other museums and galleries in Chicago include the Driehaus Museum, the Museum of Contemporary Art, the Peggy Notebaert Nature Museum, the Museum of Broadcast Communications, the Chicago Architecture Foundation, and the Industry. Chicago was the first city in the world to ever erect a ferris wheel.