Champ de Mars, Paris

Eiffel Tower. Named after the engineer Alexandre Gustave Eiffel.  It is also nicknamed The Iron Lady, as Citroën used the Tower as a commercial billboard with 'Citroën' spelt out vertically. Citroën has been the only company to use the icon as part of their advertising.  Construction was complete in 1889, its is now one of the most recognisable structures in the world.  The Tower is the also the most visited paid monument in the world.  Hard to imagine that the original plan of it's lifespan was to be only 20 yrs then be relocated.  A decision that clearly got cancelled.