Sezon 4
Bölümler
1 America's Highways 2 Eyl 1996 
2 The Telephone 15 Eyl 1996 
3 Aqueducts 6 Eki 1996 
4 Television 20 Eki 1996 
5 The Computer 24 Kas 1996 
6 Captured Light 15 Ara 1996 
7 Stealth Technology 16 Şub 1997 
8 Pyramids: Majesty And Mystery 23 Mar 1997 
9 Roller Coasters 13 Nis 1997 
10 Observatories: Stonehenge to Space Telescopes 8 Haz 1997 
11 The Great Wall of China. 22 Haz 1997 12 Air Force One: A History 1 Oca 1997
2 The Telephone 15 Eyl 1996 3 Aqueducts 6 Eki 1996 4 Television 20 Eki 1996 5 The Computer 24 Kas 1996 6 Captured Light 15 Ara 1996 7 Stealth Technology 16 Şub 1997 8 Pyramids: Majesty And Mystery 23 Mar 1997 9 Roller Coasters 13 Nis 1997 10 Observatories: Stonehenge to Space Telescopes 8 Haz 1997 11 The Great Wall of China. 22 Haz 1997 12 Air Force One: A History 1 Oca 1997