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In the late 12th century, the idea of building two concentric defensive walls arrived in Northern Europe
Full Transcript
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In the late 12th century,
00:00:02.189 --> 00:00:04.931
the idea of building two concentric defensive walls
00:00:04.931 --> 00:00:07.133
arrived in Northern Europe.
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Movie Summary
A fascinating look at how modern day structures and engineering technologies have been inspired by ancient discoveries.