Galerie de l'Évolution
Jardin des Plantes (which you'll find in the 5th arrondissement in Paris) isn't just a beautiful garden and a entertaing zoo, it's also home to the Grande Galerie de l'Évolution which is a part of Paris' natural history museum. A true must if you're even the slightest interested in these kind of things. Just the building itself is spectacular! So to sum it up: visit Jardin des Plantes and be able to check off three things on your to-do list.