ArtstorArtstor hosts ~300 collections of over 2 million images across disciplines. They have content related to contemporary and historical aspects of the practice of medicine, public health, and related fields as well as examples of the sceintific study of natural objects and organisms throughout the ages.
When searching, under Browse select "Artstor Collections" then choose browse by "Classification" and select "Science, Technology, and Industry" and you can then choose to limit by country name. You can also keyword search for plants, animals, diseases, and medical conditions.