Mexico City's metro map began with meandering route lines and the faint markings of roads to reflect the city's geography. Only the former trait has been inherited by the current version, which color codes each wiggly route line. Though the current map doesn't include them, each metro station stop is associated with a pictogram (a panda here, a wooly mammoth there), meant to aide the illiterate -- a technique Mexico City's metro shares only with that of Fukuoka, Japan.
Click on each map detail to pop out a full-size version. For more on the underground, check out a slideshow of the world's 7 greatest subways.