When ancient architects completed construction on the Great Pyramid at Giza, they left behind the greatest riddle of the engineering world how did builders lift limestone blocks weighing an average of two and a half tons, 480 feet up onto the top of the pyramid? For centuries, adventurers and Egyptologists have crawled through every passageway and chamber of the Great Pyramid, measuring and collecting data in an attempt to determine how it was built. For the first time, a revolutionary theory argues that the answer may be inside the pyramid. Architect Jean-Pierre Houdin has devoted his life to solving this mystery by creating incredibly accurate blueprints of the Great Pyramid, using cutting-edge 3-D software. Unlocking the Great Pyramid follows Houdin and renowned Egyptologist Bob Brier in Giza as they put Houdins theory to the test.