"contre-jour" on the gloriette of the labyrinth of the Jardin des Plantes in Paris, France. This is one of the most ancient metallic building in the world, made by Edme Verniquet in 1788 in honor of Buffon
<a href="//commons.wikimedia.org/wiki/User:Jebulon" title="User:Jebulon">Jebulon</a>
<span class="int-own-work" lang="en">Own work</span>