Spiral staircase at La Conciergerie, Paris. Former royal palace and prison in on the Île de la Cité, it is part of the larger complex known as the Palais de Justice. Built in the Middle Ages as a Merovingian Palace.
This website has beautiful travel photographs from world travelers. I could not stop looking and now I have a very long list of places I want to visit. Floral Entry, Grimaund, Provence, France photo via besttravelphotos