Palais de la Porte Dorée: Museum of Immigration & Tropical Aquarium

You won't often find passions for architecture, aquatic animals, and human history catered for in one place. But then, the Palais de la Porte Dorée is more than merely an exhibition hall. Skip the lines and look around this Art Deco masterpiece, which permanently exhibits the unique and fascinating history of immigration in France, alongside a rather tantalizing tropical aquarium housing over 15,000 different animals and 750 separate species.