The Roseraie du Jardin des Plantes, located along the Galerie de Minéralogie, to the right of the Muséum national d'Histoire naturelle or to the left if you're coming from the Seine, is a wonderful place to discover in spring and especially in June. With its 390 species of old and modern roses, it's a magnificent and free rose garden, in addition to the superb rosebushes that stand proudly in front of the Muséum.