Popular Mechanics has a photo gallery of eighteen unusual airports around the world, including the above airport of Courchevel, a town in the French Alps. The runway has a hill the middle with a 18.5% grade. Landing on this airstrip is so difficult that it requires a special pilot's certification.
http://www.popularmechanics.com/technology/transportation/4346192.html?page=1 via Glenn Reynolds| Photo: Popular Mechanics