The Arc de Triomphe du Carrousel was built between 1806 and 1808 by architects Percier and Fontaine for Napoleon I following the model of the Arc of Constantine in Rome. The two arches in Paris built by Napoleon - Arc de Triomphe du Carrousel and the Arc de Triomphe at Etoile, were to commemorate his victories, and the grand army who had won them. The Arc de Triomphe du Carrousel is decorated in rose marble on the columns and the front paneling. It is composed of threes arches: a big one and two little ones. It is part of the Grand Ax of Paris. Parts are defined by the Grande Arch de la Defense, the Arc de Triomphe at Etoile, the Champs-Elysees, the Obélisque de Luxor at the Place de la Concorde, the Arc de Triomphe du Carrousel and reaches to the Louvre. The latest addition to the Louvre was the glass pyramid entrance, which is an example of a combination of modern and historic architecture and was designed by I.M. Pei. The Louvre houses about 35,000 works of art, like the Mona Lisa from Leonardo da Vinci, Venus de Milo and Winged Victory.