8. Mexico City Metro, Mexico
On Sept. 4, 1969, the Mexico City Metro opened up to begin serving the metropolitan areas of the capital city. Traffic jams have long plagued residents of this city who have cited 1-2 hour commutes just to travel between neighboring cities, so the metro is a great alternative. If you don’t believe us, just ask the passengers who made up the 1.605 billion rides in 2016.