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.
Places I've been: Mount San Michel, France. ✮ Mount San Michel at certain times is engulfed by the water and reveals the splendor of construction. Set in a medieval town called Avranches, this monastery was fortified in the thirteenth century.