Nezu Museum

Nezu Museum, or Nezu Bijutsukan (根津美術館), is a private museum focusing on classical Japanese and other Asian arts collected by Nezu Kaichiro (1860-1940), who was the president of Tobu Railway. The museum houses more than 7,400 objects, including seven National Treasures and 87 Important Cultural Properties. Since it's forbidden to take photos of them I cannot show you its collection but you can check some of them on its official website.
The grounds of the museum used to be a suburban residence of a domain lord in the Edo period, and Nezu built his house here in the following Meiji era. The Japanese stroll garden attached to the museum became what it looks like now in those days. Nezu was a master in the way of tea so several tea houses are placed along the paths that run through the garden. The garden itself is highly tea garden-like. After Nezu's death, the museum was opened to the public in 1941.
The present exhibition building designed by Kuma Kengo, a renowned architect in Japan, was constructed in 2009.
It's an 8-minute walk from Omotesando Station of Tokyo Metro Ginza Line, Hanzomon Line, or Chiyoda Line.

There's Chokokuji Temple near this museum.