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.
50 destinos naturales donde debería ser siempre otoño
Château de Chambord, the Loire Valley, France. This castle was abandoned after the French Revolution until World War II. During the war it was used to protect priceless pieces of art from the Louvre and other French galleries.