Big Bus Tours[1] (formerly Les Cars Rouges and The Big Bus Company), is the largest operator of open top bus sightseeing tours founded in May 2011 after "Les Cars Rouges" and the "Big Bus Company" merged. The company operates in 20 cities of 11 countries with more than 150 buses around the world.[2] The United States is the country with the largest number of cities with Big Bus Tours service. Typically, Big Bus Tours use open top double-decker buses in burgundy and cream-coloured livery.

Chicago (/ʃɪˈkɑːɡoʊ/ (About this soundlisten), locally also /ʃɪˈkɔːɡoʊ/), officially the City of Chicago, is the most-populous city in the U.S. state of Illinois and the third-most-populous city in the United States. With an estimated population of 2,705,994 (2018), it is also the most-populous city in the Midwest. Chicago is the county seat of Cook County, the second-most-populous county in the US, and portions of the city extend westward into neighboring DuPage County. It is the principal city of the Chicago metropolitan area, often referred to as Chicagoland. At nearly 10 million people, the metropolitan area is the third-most-populous in the nation.

Located on the shores of freshwater Lake Michigan, Chicago was incorporated as a city in 1837 near a portage between the Great Lakes and the Mississippi River watershed and grew rapidly in the mid-19th century.[7] After the Great Chicago Fire of 1871, which destroyed several square miles and left more than 100,000 homeless, the city made a concerted effort to rebuild.[8] The construction boom accelerated population growth throughout the following decades, and by 1900, Chicago was the fifth-largest city in the world.[9] Chicago made noted contributions to urban planning and zoning standards, including new construction styles (including the Chicago School of architecture), the development of the City Beautiful Movement, and the steel-framed skyscraper.[10][11]

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