Cars Rouges (Les), Paris

This is a great way to get around the capital and bulk up on its history at the same time (commentaries are available in several languages). Simply buy your ticket-which remains valid for two days-when you board the bus. The whole tour lasts just over two hours. Climb aboard at different places along the route, choosing from the Eiffel Tower (Quai Branly), the Champ de Mars (Avenue Joseph-Bouvard), the Louvre (Pont des Arts), Notre-Dame (21, Rue d'Arcole), the Muse d'Orsay (9, place de Montherlant), Galeries Lafayette (40, boulevard Haussmann), 156 Avenue des Champs-Elys, the Grand Palais (Avenue Winston-Churchill) or the Trocad (Avenue Paul-Doumer).