I grew up not-too-far from Neenah Foundry, whose hole-covers I've seen everywhere I've gone (Wisconsin obviously, UK, Japan (e.g. a news article mentions Okinaw

I grew up not-too-far from Neenah Foundry, whose hole-covers I've seen everywhere I've gone (Wisconsin obviously, UK, Japan (e.g. a news article mentions Okinawa[1]), CA/FL/NY/MD/WA states, I've seen at least one reference that theirs are/were under the Eiffel tower, etc). It's quite a lot of reach for a foundry in a town of ~25k. It has been an idle source of entertainment over the years, I keep a an eye open for manufacturer names on municipal cast iron stuff :) If you ever go to Japan, definitely keep your eyes down. There are a TON of fancy covers, lots of them enameled, in both big cities and tiny towns. [1]: https://www.postcrescent.com/story/entertainment/2018/09/06/neenah-manhole-cover-madness-what-expect-inaugural-celebration/1193195002/ https://www.postcrescent.com/story/entertainment/2018/09/06/...