* Moscow, Russia: The Moscow Metro is the fourth largest metro system in the world, with over 200 stations and 12 lines.
* Shanghai, China: The Shanghai Metro is the sixth largest metro system in the world, with over 300 stations and 18 lines.
* New York City, United States: The New York City Subway is the largest rapid transit system in the United States, with over 470 stations and 27 lines.
* Paris, France: The Paris Métro is the second largest metro system in Europe, with over 300 stations and 16 lines.
* Tokyo, Japan: The Tokyo Metro is the largest metro system in the world, with over 900 stations and 13 lines.
