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- 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 6 Demolition
- Season 6 The Atlantic Wall
- Season 6 History of Tall Buildings
- Season 6 Aquariums
- Season 6 Las Vegas Hotels.
- Season 6 The Oakland Bay Bridge.
- Season 6 Monumental Statues
- Season 6 Antibiotics: The Wonder Drugs
- Season 6 The Police Car
- Season 6 Plastics
- Season 6 Medical Imaging
- Season 6 Extreme Sports Gadgets
- Season 6 Bombs
- Season 6 Prosthetics
- Season 6 Weather Prediction
- Season 6 Stereos
- Season 6 Mail Delivery
- Season 6 Clocks
- Season 6 Airships.
- Season 6 Physical Fitness
- Season 6 Engineering Disasters
- Season 6 City Parks
- Season 6 Spy Technology
- Season 6 Battlefield Medicine
- Season 6 U.S. Mints: Money Machines
- Season 6 Rescue Equipment
- Season 6 Scuba And Deep Sea Diving
- Season 6 Offshore Oil Drilling
- Season 6 Dynamite.
- Season 6 Hoover Dam.
- Season 6 Baseball Parks
- Season 6 New York Bridges
- Season 6 Crash Testing
- Season 6 Parachutes
- Season 6 Newspapers
- Season 6 Fireworks
- Season 6 Simulators
- Season 6 The Tool Bench: Power Tools
- Season 6 The Tool Bench: Hand Tools
- Season 6 More Earthmovers.
- Season 6 Forts
- Season 6 Emergency Room
- Season 6 Motorcycles
- Season 6 Security Systems
- Season 6 More Engineering Disasters.
- Season 6 Niagara Power
- Season 6 Casino Technology
- Season 6 Lost Marvels
Modern Marvels - Season 6 Episode 41 Forts
7.90 44 minutes The art of fortification evolved along with man’s need to defend his territory from attack. There was no other reason. From hills surrounded by branches and crude fences to intricate walled cities, to impenetrable castles – the strongholds of the past echo the history of great battles for territorial control.
