The Grand Palais exhibition hall, designed by architects Henri Deglane and Albert Louvet for the 1900 World Exhibition, lies between the Seine and the Champs-Élysées. With its iron, steel, and glass structured roof, it is an impressive testimony to the innovative engineering of its day. Today, the Grand Palais houses temporary exhibitions and the great Parisian FIAC art fair. The science museum Palais de la découverte and its planetarium are located in the west wing.