Season
- Season 1 1993-12-10
- Season 2 1994-12-16
- Season 3 1995-08-20
- Season 4 1996-09-02
- Season 5 1997-08-17
- Season 6 1998-07-27
- Season 7 2000-01-03
- Season 8 2001-01-08
- Season 9 2002-01-02
- Season 10 2003-01-01
- Season 11 2004-01-16
- Season 12 2005-01-05
- Season 13 2006-01-04
- Season 14 2007-01-17
- Season 15 2008-01-07
- Season 16 2010-01-14
- Season 17 2010-10-29
- Season 18 2011-10-03
- Season 19 2013-07-16
- Season 20 2021-02-20
- Season 21 2021-07-25
- Season 22 2021-11-28
- Season 23 2022-02-16
Season 23 Episode
- Season 8 Battle Gear.
- Season 8 Proving Grounds
- Season 8 Commercial Jets
- Season 8 Apollo 13
- Season 8 Survival Technology
- Season 8 Chesapeake Bay Bridge and Tunnel
- Season 8 Garage Gadgets
- Season 8 Construction Machines
- Season 8 Hadrian's Wall
- Season 8 Monster Trucks.
- Season 8 Lighthouses
- Season 8 Computers
- Season 8 Engineering Disasters 3.
- Season 8 Chemical And Biological Weapons
- Season 8 International Airports II
- Season 8 Codes.
- Season 8 The M-16
- Season 8 The Colosseum
- Season 8 The World Trade Center
- Season 8 Hardware Stores
- Season 8 Saloons
- Season 8 More Gadgets
- Season 8 Cattle Ranches
- Season 8 Cannons.
- Season 8 Nuclear Subs
- Season 8 Air Shows
- Season 8 West Point
- Season 8 Quarries.
- Season 8 Diamond Mines
- Season 8 The House
- Season 8 Work Clothes
- Season 8 Bunkers.
- Season 8 Cemeteries.
- Season 8 War Games
- Season 8 Drive-Thru
- Season 8 Times Square
- Season 8 Los Angeles
- Season 8 Glass
- Season 8 Firing Ranges
- Season 8 The St. Louis Arch
Modern Marvels - Season 8 Episode 16 Codes.
7.97 44 minutes Whenever a culture reaches a level of sophistication in literacy, science, and language, codes spring up spontaneously. As the social life of a community increases in complexity, the demands for private communication between two or more people inevitably lead to cryptology–a system of secret symbolic messages. We explore the rich history of communicating with secret symbols–from Egyptian hieroglyphics to Caesar's encrypted directives, from WWI and WWII codebreakers to cyberspace.
