| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Air Force One: A History |
January 1, 1997
H2
|
44 | |
| S04E02 | Captured Light |
December 15, 1996
History
|
46 | |
| S04E03 | Stealth Technology |
February 16, 1997
History
|
44 | |
| S04E04 | Pyramids: Majesty and Mystery |
March 23, 1997
History
|
44 | |
| S04E05 | Roller Coasters |
April 13, 1997
History
|
46 | |
| S04E06 | Observatories: Stonehenge To Space Telescopes |
June 8, 1997
History
|
43 | |
| S04E07 |
The Great Wall Of China
season finale
|
June 22, 1997
History
|
45 | |
| S04E08 | Satellites |
August 17, 1997
H2
|
44 | |
| S04E09 | Radio: Out of Thin Air |
August 24, 1997
H2
|
44 | |
| S04E10 | Great Towers in the Sky |
September 7, 1997
H2
|
44 | |
| S04E11 | Household Wonders |
September 14, 1997
H2
|
44 | |
| S04E12 | Radar |
September 21, 1997
H2
|
44 | |
| S04E13 | Forensic Science |
September 28, 1997
H2
|
44 | |
| S04E14 | Polio Vaccine |
October 5, 1997
H2
|
44 | |
| S04E15 | The Stock Exchange |
October 12, 1997
H2
|
44 | |
| S04E16 | NORAD: The War Game Fortress |
October 19, 1997
H2
|
44 | |
| S04E17 | Earth Movers: The Power to Move Mountains |
October 27, 1997
H2
|
44 | |
| S04E18 | International Airports |
October 28, 1997
H2
|
44 | |
| S04E19 | Deep Sea Exploration: Challenging the Abyss |
November 3, 1997
H2
|
44 | |
| S04E20 |
The Alaskan Oil Pipeline
season finale
|
November 4, 1997
H2
|
44 | |
| S04E21 | Aqueducts |
January 4, 1998
H2
|
44 | |
| S04E22 | American Steel: Built to Last |
January 18, 1998
H2
|
44 | |
| S04E23 |
Battlefield Engineering
season finale
|
February 8, 1998
H2
|
44 |