Underneath Tokyo, Japan.
A quiet moment in the otherwise very hectic Tokyo subway. The way the various lines of the massive system work together literally resembles a spaghetti bowl when you look at the system map. It takes a while to understand how it all works, but it is absolutely the best way to get around when you’re there.
One of the things they do that makes it easier than it seems to navigate, is numbering each station. The station signs on the platform tell you which direction to go to get to the next and previous station numbers. Brilliant. Not sure why other places don’t do that. Not in DC, New York, Chicago, or Boston.