Deep in the mountains of northern Laos is one of the most dangerous archaeological sites ever. The last remnants of an ancient civilization are next to 30-year-old craters and unexploded U.S. ordnance left by the greatest aerial bombardment of all time. Signs of the “secret war” are clearly visible at several of the sites, in the form of bomb craters and damaged jars. Archaeologists are certain the Plain of Jars is one of Southeast Asia's most important archaeological sites--but it is one with more questions than answers.
