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.
Sliding Rock, Brevard, NC: Think of this angled rock face as nature’s original waterslide. Smoothed by centuries of flowing water, the boulder shoots bathers into the frigid Carolina mountain waters like they have buttered backsides.