Sezon 3
Bölümler
1 Berlin Wall 14 Mar 2006 2 Impossible bridges: Denmark to Sweden 18 Nis 2006 3 Impossible Bridges: Greece 2 May 2006 4 Apache Helicopter 13 May 2006 
5 Hoover Dam 16 May 2006 6 Inside NCIS 30 May 2006 7 Impossible Bridges:China 11 Tem 2006 8 Garbage Mountain 1 Ağu 2006 9 Ice Hotel 1 Ağu 2006 10 Machines of War: Tanks 17 Ağu 2006 11 Supertanker 31 Ağu 2006 12 Machines of War: Missiles 7 Eyl 2006 
13 How it's built: Steel 21 Eyl 2006 14 Machines of War: Guns 12 Eki 2006 15 Panama Canal Unlocked 19 Eki 2006 16 Science of Bricks 2 Kas 2006 17 Science of Concrete 14 Kas 2006 18 Megafactories Ferrari 7 Ara 2006 19 Ultimate Structures: Super Pipeline 18 Ara 2006 20 Rockeaters of Iceland 31 Ara 2006
5 Hoover Dam 16 May 2006 6 Inside NCIS 30 May 2006 7 Impossible Bridges:China 11 Tem 2006 8 Garbage Mountain 1 Ağu 2006 9 Ice Hotel 1 Ağu 2006 10 Machines of War: Tanks 17 Ağu 2006 11 Supertanker 31 Ağu 2006 12 Machines of War: Missiles 7 Eyl 2006 13 How it's built: Steel 21 Eyl 2006 14 Machines of War: Guns 12 Eki 2006 15 Panama Canal Unlocked 19 Eki 2006 16 Science of Bricks 2 Kas 2006 17 Science of Concrete 14 Kas 2006 18 Megafactories Ferrari 7 Ara 2006 19 Ultimate Structures: Super Pipeline 18 Ara 2006 20 Rockeaters of Iceland 31 Ara 2006