Musée de la Médecine (Brussels, Belgium)

This museum was created in 1995 to house a variety of medical specimens, most notable of which are a collection of vintage wax models illustrating all sort of horrible venereal diseases and malformations of the genitals.  In other words, when in Brussels, you absolutely need to stop here!

Morbid Anatomy has an article about the museum and a lovely collection of images on Flickr.