Abandoned Engineering: Britain's Sea Fort Complex

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The Red Sands Sea Fort was originally built to protect London from the Nazi threat in 1945. Massive engineering for the time, seven steel boxes rise 80-feet out of the water at the mouth of the River Thames. Also investigated a 4,000 tonne rusted mass of steel in a field in Eastern Germany, an empty complex located in Philadelphia, and in North Dakota a sinister looking concrete pyramid dating back to the Cold War.