Modern Marvels
Season 6, Episode 41: Forts
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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.
All Episodes - Season 6
Episode 1
Demolition
Episode 2
The Atlantic Wall
Episode 3
History of Tall Buildings
Episode 4
Aquariums
Episode 5
Las Vegas Hotels.
Episode 6
The Oakland Bay Bridge.
Episode 7
Monumental Statues
Episode 8
Antibiotics: The Wonder Drugs
Episode 9
The Police Car
Episode 10
Plastics
Episode 11
Medical Imaging
Episode 12
Extreme Sports Gadgets
Episode 13
Bombs
Episode 14
Prosthetics
Episode 15
Weather Prediction
Episode 16
Stereos
Episode 17
Mail Delivery
Episode 18
Clocks
Episode 19
Airships.
Episode 20
Physical Fitness
Episode 21
Engineering Disasters
Episode 22
City Parks
Episode 23
Spy Technology
Episode 24
Battlefield Medicine
Episode 25
U.S. Mints: Money Machines
Episode 26
Rescue Equipment
Episode 27
Scuba And Deep Sea Diving
Episode 28
Offshore Oil Drilling
Episode 29
Dynamite.
Episode 30
Hoover Dam.
Episode 31
Baseball Parks
Episode 32
New York Bridges
Episode 33
Crash Testing
Episode 34
Parachutes
Episode 35
Newspapers
Episode 36
Fireworks
Episode 37
Simulators
Episode 38
The Tool Bench: Power Tools
Episode 39
The Tool Bench: Hand Tools
Episode 40
More Earthmovers.
Episode 41
Forts
Episode 42
Emergency Room
Episode 43
Motorcycles
Episode 44
Security Systems
Episode 45
More Engineering Disasters.
Episode 46
Niagara Power
Episode 47
Casino Technology
Episode 48
Lost Marvels