A massive archive of historical Japanese maps & related ephemera.
http://www.asocie.jp/index.html 

Enter at your peril.

Navigation is tricky but so far every click has delivered something delightful!
http://asocie.jp/index.html 

The photography section is also incredible.

Postcards & pics from cities, tourist sites, theme parks, coastal resorts etc.

http://www.asocie.jp/archives/index.html

OMG.
http://asocie.jp/index.html 

ok, going to do some proper work now. Enjoy :)