The Parasitological Museum Of Meguro

It's not the best place to take a date, nor would you want to visit after eating a large meal, but Meguro's Parasitological Museum in Tokio is a wonderful excursion. And a horrifying one.
Privately founded in 1954 by a doctor, Meguro's is the only Parasitological Museum in the world, with over 300 specimens on display. The focus is on human parasites, with information about their life-cycle, reproduction methods and habitats.