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Arc de Triomphe
Standing tall at the west end of the famous Champs-Élysées is the Arc de Triomphe. Perhaps the most famous arc in the world, it was constructed by Napoleon to honor his military victories and remember the soldiers who fell in his campaigns. It also houses the Tomb of the Unknown Soldier, honoring the soldiers of the First World War. You can join a tour that takes you to the small museum inside the arc and ends at a rooftop terrace which offers great views of the city.
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Grande Arche
Also known as the Arche de la Défense, La Grande Arche is a monument and building in the business district of La Défense. A great national design competition was launched in 1982 as the initiative of French president François Mitterrand. Danish architect Johann Otto von Spreckelsen (1929–1987) and Danish engineer Erik Reitzel designed the winning entry to be a 20th century version of the Arc de Triomphe: a monument to humanity and humanitarian ideals rather than military victories. (source:wikipedia.org)