Plot: The second series explores the mysteries of twelve ancient wonders: The Tomb of Tutankhamun, the Great Sphinx at Giza, the Mexican pyramid city of Teotihuacan, the Egyptian temple complex at Karnak, Cambodia’s Angkor Wat, Scotland’s Stirling Castle, Stonehenge, the Taj Mahal, the Inca city of Machu Picchu, China’s ancient Terracotta Army, Jordon’s secret city of Petra and the Coliseum at Rome.