This is cool. Explains CityLab:
Entomological unease aside, this poster of the planet’s 140 metros should make a fantastic holiday gift for the city-obsessed nerd. Made by Neil Freeman, an artist and urban planner who runs the site Fake Is the New Real, the roughly29 by 23-inch, black-and-white sheet stacks train systems with the largest ones at top…
...and the most basic at bottom.
Take a look at the artist's designs and find your metro.