The Coolest Places Around the World From Where You Can Mail a Letter
Pack mules carrying United States Postal Service mail bins traverse the trail between the Hualapai Hilltop and the Supai Village on June 21, 2011, on the Havasupai Indian Reservation in the Grand Canyon. (Photo by Julia Beverly/Getty Images)Julia Beverly/Getty Images United States — a post office where mules deliver the male At the bottom of…