What happens when an adventure travel expert-who's never actually done anything adventurous-tries to re-create the original expedition to Machu Picchu?July 24, 1911, was a day for the history books. For on that rainy morning, the young Yale professor Hiram Bingham III climbed into the Andes Mountains of Peru and encountered an ancient city in the clouds: the now famous citadel of Machu Picchu. Nearly a century later, news reports have recast the hero explorer as a villain who smuggled out priceless artifacts and stole credit for finding one of the world's greatest archaeological sites.Mark Adams has spent his career editing adventure and travel magazines, so his plan to investigate the allegations against Bingham by retracing the explorer's perilous path to Machu Picchu isn't completely far- fetched, even if it does require him to sleep in a tent for the first time. With a crusty, antisocial Australian survivalist and several Quechua-speaking, coca-chewing mule tenders as...