Galeries Lafayette Haussmann is a Parisian shopping icon since 1912, famous for its stunning Art Nouveau glass dome rising 43 meters. The luxury department store houses over 3,500 brands across three buildings. Hidden gem: The free rooftop terrace offers 360-degree panoramic views of Paris from the Eiffel Tower to Montmartre. The store also offers free fashion shows and architectural tours. The interior is an architectural masterpiece worth visiting even if you do not buy anything.