Paris, Île-de-France, France
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The Elephant of Charles Ribard (never built)

In 1758, Charles Ribard designed an elephant to grace to the Champs-Élysées in the spot where the Arc de Triomphe now stands.

It consisted of three levels, to be built in the shape of an elephant, with entry via a spiral staircase in the underbelly. The building was to have a form of air conditioning, and furniture that folded into the walls. A fountain -- or perhaps the plumbing -- was to flow from the elephant's trunk.

It was never built. However, in 1808 Napoleon would later conceive a similar construction as a monument to his conquests, the Elephant of the Bastille.

The Elephant of Charles Ribard (never built)