Step through 19th-century glasshouses into a tropical world most visitors never expect to find in Paris. The Jardin des Serres d'Auteuil shelters over 6,000 exotic plants across five monumental greenhouses, where palms tower overhead and parakeets chatter in the aviary. Wander from humid orchid rooms to dry cactus collections, then escape into outdoor gardens styled after English, Japanese, and French traditions.