The great dame of Paris, the most famous, the most universal, is made of iron. Its maker was Gustav Eiffel, and is the most popular icon of the most romantic city in the world. Of course, sometimes you see it up close, from very close, and certainly has its drawbacks and one sees a large bunch of irons, a chaos of cables, but yes, from there, you get the best views of the city of light. Worth the climb.
Picture taken from The Eiffel Tower in Paris