How did they do it? Without the advanced technologies ubiquitous in the modern age, the seemingly miraculous Colosseum, Chartres Cathedral, and Great Pyramid of Giza were built employing the surprising means studied in this enlightening three-part documentary series from National Geographic. Learn how slavery, innovative architecture, and royal decrees all played a part in these astonishing feats of engineering bravado. Soundtrack: English. Two-disc set.