I never thought I'd want to use the words "beautiful" and "manhole" in the same sentence, but here we are. These lovingly-designed manhole covers are all over Japan, and each region or town gets to design their own, like a personalized flag that has just a bit more function. Street art has just reached a whole new level. There are also whole Flickr groups dedicated to collecting all the different covers, and each is more detailed than the last. Scroll through for some of the highlights, and then go check out the thousands more on Flickr.