Comment by cl42

Meguro Parasitological Museum is fantastic and en...grossing. :) It's a fun area to visit in general. Highly recommend it.

Also...

Yamato History Museum: https://www.yamato-hd.co.jp/museum/en/

... and if you are near Hiroshima, the Toto Museum is a history of toilets + washroom innovation and surprisingly fascinating. https://jp.toto.com/en/knowledge/visit/museum/