In & Around:
Interior of Tokyo The National Art Center (国立新美術館 Kokuritsu Shin-Bijutsukan).
It is one of the largest exhibition spaces in the country. I found that sometime they close on the weekend, so check out their website for opening time before go. http://www.nact.jp/
It is an interesting place to go even if you are not interesting in see any exhibition inside. It free to enter the building.
Tripod is not allowed here.