That same area of japan I see in every anime...

[Groteske]

http://www.onemanga.com/Katekyo_Hitman_Reborn/237/13/
http://www.onemanga.com/Katekyo_Hitman_Reborn/237/11/
http://www.youtube.com/watch?v=9cljrUh3LEc @ 4:15 here

The bridge they fought at in Bleach: Memories of Nobody i think(ill look for a clip i have to)

It'd be troublesome to find more, but that should be enough. >.<

Oh you mean that canal thing?

Well could just be a guess but they do have a lot of canals in Japan.....perhaps it's just a coincidence they look similar?

But hmm if you find out anything specific I'd love to know! :3