Secrets of the Sky Caves

What''s more dangerous than scaling Mount Everest? For mountaineer Pete Athans, the answer lies in the ancient kingdom of Mustang, a remote part of the Asian nation of Nepal. Long-abandoned caves built high into steep cliffs contain amazing treasures—and pose incredible dangers. Reaching these "sky caves" safely takes guts, smarts, and luck. And then there''s the question of what to do with a two-...