Chicago is one of the most important cities in the United States. A major metropolis and key transportation center of the American heartland, Chicago boasts a population of nearly 3 million people, making it the third most populous city in the country. It is a city of architectural gems, vibrant neighborhoods, beloved sports teams, prestigious cultural institutions, major industries and outstanding attractions. Chicago's most famous attractions include: The renowned Art Institute of Chicago, founded in 1879, is one of the oldest and largest art museums in the United States and has a permanent collection of nearly 300,000 artworks. Navy Pier, a 3,300-foot-long pier in Streeterville, covers 50 acres and offers outstanding shops, restaurants, theaters, parks and gardens, that attracts over 9 million visitors each year. Millennium Park offers music and the famous Cloud Gate sculpture -- nicknamed the Bean because of its shape -- which lets visitors see their own reflection mirrored against the city's breathtaking skyline. Magnificent Mile, a section of Michigan Avenue that is home to many of the city's tallest buildings including John Hancock, Wrigley Building, Tribune Tower, Chicago Water Tower and the Drake Hotel. Wrigley Field, home of the Chicago Cubs since 1916, is the oldest National League ballpark in the country.