Metropolitan Government Building

Heck, any building that offers a free 360 degree view (if you cheack out both towers) of Tokyo is worth a visit. If you have time, check out the day view as well as the night view. It kinda freaked me out when I first came to Tokyo that the buildings just keep going on and on and on and on.

http://www.bento.com/arch/tmgo.html

A great vantage point to see the entire city, even Mount Fuji on a good day. And you don’t have to pay! It’s brilliant.