Places I'd like to visit if my feet were made of giant foam cushions reinforced with kevlar: The Tsingy de Bemaraha national park and reserve in Madagascar. "This 600-square-mile protected area is an island unto itself," according to a National Geographic story with a gorgeous photo gallery, "a kind of biofortress, rugged, largely unexplored, and made nearly impenetrable by the massive limestone formation-the tsingy-running through it." Made up of jagged, 300-foot-tall stone spires called "grikes," the tsingy is apparently like Manhattan combined with the most horrible gravel driveway you ever stepped on barefoot.