One of the enchantments of the view--and some others in Paris--is that is has all the qualities of a trompe-loeil (literally, deceive the eye) painting into which, extraordinarily, one can walk. From the bottom of the hill the five-arched Pont d'Iéna springs across the river. It was built for Napoleon I in 1814, although the imperial "N"s with which it is decorated were in fact put there by Napoleon III. After the bridge comes the unclad metal truss tower of Gustave Eiffel.