Here are some Chicago conversation starters, even some the city's locals might not know ...
• Chicago has more than 5500 restaurants, more than 200 theatres, around 200 art galleries, 552 parks and 41km of lakefront including 30km of lakefront bike trails.
• Made a city in 1837, Chicago's nicknames include the City of Big Shoulders, the Second City, The Windy City and The City That Works.
• In 1900, Chicago completed a massive and innovative engineering project - reversing the flow of the Chicago River to empty into the Mississippi River instead of Lake Michigan. The main reason was to improve the quality of the city's drinking water.
• Each year, to celebrate St Patrick's Day, the Chicago River is dyed green.