Thanks to the movies, Petra may be the most recognizable of all of the modern 7 Wonders of the World. If it doesn't ring a bell, think about Indiana Jones entering a crazy looking temple built into the side of a mountain. Yeah, that's real!! We explore the history of Petra, how the Nabateans constructed this intricate city, the various rulers, uses of the trade city, and of course, the engineering behind this marvel.