Amazing double-helix staircase in the Château de Chambord, Loire Valley, France. The two helixes ascend three floors and never meet. In the center is an open air shaft that lets in light. Some believe Leonardo da Vinci designed the staircase.
Chateau de Chambord, France - Part of: http://www.topinspired.com/top-10-fairy-tale-castles-in-europe/ - Having read the biographies of Catherine de Medici and Diane de Poitiers, this château is nicknamed the “Château des Dames” because King Henry II gave this castle to his mistress Diane de Poitiers, but when he died, his wife, the Queen Catherine de Medici threw out Diane and installed herself there. A must visit! - Dragan https://twitter.com/Colorful_Planet