A personal favorite from my Etsy shop https://www.etsy.com/listing/247237690/manhole-covers-of-detroit
More awesome Detroit images from my Etsy shop https://www.etsy.com/listing/247235862/detroit
A personal favorite from my Etsy shop https://www.etsy.com/listing/256314657/carousel-horses
Louisville --manhole cover downtown
Minneapolis: Lady's Slipper Manhole Cover | Flickr - Photo Sharing!
Japanese Manhole Cover
streetart - japanese art of man hole covers
Ottawa, Ontario, Canada
Minnesota. All this took was one person deciding to do something well - and then doing it, even manhole covers can add to the beauty of the world.
Budapesti Elektromos Müvek Tulajdona Manhole Cover
Some great manhole covers in this slide show. This one from Seoul is my favorite since it is actually very useful!
Japan's Manhole Covers