The stuff hidden underneath the manhole covers of the world ranges from unremarkable to downright disgusting.

But just because they're hiding unspeakable stuff doesn't mean that the covers themselves have to be ugly. Some cities forego the boring bare-bones discs of iron favored by most municipalities. Instead, they opt to cap their underground infrastructure with metal masterpieces. To see some of these classic covers,

The next time you travel around the country or overseas, look down and you might just see a work of art under your feet.