In the Bolivian Andes, a sprawling ancient city rests 13,000 feet above sea level. With its giant, freestanding monoliths and grand design, Tiwanaku has long been compared to Stonehenge. The two sites were built on opposite sides of the globe, but they both share a design that pays tribute to the sun. What's the "real" connection between Stonehenge and Tiwanaku? Flying out from La Paz, host Josh Bernstein tours Tiwanaku from both the air and ground. He harvests and transports the very stone used to build Tiwanaku and, he dives Lake Titicaca to explore evidence of a lost civilization.