The transportation system in Chicago is known for its extensive network of trains, buses, and highways. The city is served by the Chicago Transit Authority (CTA), which operates the "L" train system and buses. Additionally, there are suburban trains known as Metra, which connect the city to surrounding areas. Chicago also has an extensive highway system, with major expressways such as the Dan Ryan and Kennedy Expressways. Taxis, rideshare services, and bike-sharing programs are also popular modes of transportation in the city.
What are some famous landmarks in Chicago?