Chicago is a large city in the northeast of the U.S. state Illinois. Chicago is situated at the shores of Lake Michigan, one of the five large lakes of North America. The core of the city is home to around 2.7 people and the greater Chicago area has more than 9.7 inhabitants. In Chicago, a great number of international enterprises have their seats and the city is also famous for its trade fairs and exhibitions. Furthermore, the largest public library of the world and numerous universities can be found in Chicago. Chicago is characterized by various cultural events that take place regularly over the year. Chicago, which is the third-largest city of the US, also has a unique skyline. The different quarters of the city all have interesting cultures. Especially in the summer months, the weather is pleasant. Moreover, the infrastructure of Chicago is well-established and varied. The International Airport Chicago O’Hare is the fourth-largest international airport in the world according to passenger numbers.