EP1 - Berlin Wall EP2 - Impossible Bridges: Denmark to Sweden EP3 - Impossible Bridges: Greece EP4 - Hoover Dam EP5 - Inside NCIS EP6 - Garbage Mountain EP7 - Ice Hotel EP8 - Supertanker EP9 - Machines of War: Missiles EP10 - Science of Steel EP11 - Episode 11 EP12 - Machines of War: Guns EP13 - Panama Canal Unlocked EP14 - Science of Bricks EP15 - Science of Concrete EP16 - Megafactories Ferrari EP17 - Impossible Bridges:China EP18 - Ultimate Structures: Super Rigs EP19 - Rockeaters of Iceland EP20 - Episode 20