This is a study of manhole covers from Japan.   Manhole covers were photographed in Japan during in 2007 and 2009.
All photos copyrighted by Allan Wood and an unknown photographer (send me your name, I lost it).
Japan is a very old country, with lots of history, and interesting and different manhole covers.   I have yet to visit Japan but two people sent me photographs of some manhole covers that I have posted here.   Information about Japan can be found here.