"First planted in 1635 as a medicinal herb garden by Guy de la Rousse, Louis XIII’s physician, these days Le Jardin des Plantes offers 69 sprawling acres of botanical gardens, scenic trails, and a natural history museum. The highlight, though, is a small zoo, which was founded in 1795, making it the second oldest in the world that’s still in existence (it’s outranked by Tiergarten Schönbrunn in Austria). Once home to animals from Versailles’ royal menagerie, the zoo is now known for its unusual, exotic (and often endangered) species."