3 - 1Berlin Wall Mar. 14, 2006- 3 - 2Impossible Bridges: Denmark to Sweden Apr. 18, 2006
- 3 - 3Impossible Bridges: Greece May. 02, 2006
3 - 4Hoover Dam May. 16, 2006- 3 - 5Inside NCIS May. 30, 2006
- 3 - 6Garbage Mountain Aug. 01, 2006
- 3 - 7Ice Hotel Aug. 01, 2006
- 3 - 8Supertanker Aug. 31, 2006
- 3 - 9Machines of War: Missiles Sep. 07, 2006
- 3 - 10Science of Steel Sep. 21, 2006
- 3 - 11Episode 11 Oct. 05, 2006
- 3 - 12Machines of War: Guns Oct. 12, 2006
- 3 - 13Panama Canal Unlocked Oct. 19, 2006
- 3 - 14Science of Bricks Nov. 02, 2006
- 3 - 15Science of Concrete Nov. 14, 2006
- 3 - 16Megafactories Ferrari Dec. 07, 2006
- 3 - 17Impossible Bridges:China Jul. 11, 2006
- 3 - 18Ultimate Structures: Super Rigs Dec. 18, 2006
- 3 - 19Rockeaters of Iceland Dec. 31, 2006
- 3 - 20Episode 20 Dec. 31, 2006