Home / Series / How Did They Build That? / Aired Order / Season 1 / Episode 2

Defence: Use of Mass

Great walls protect a Scottish castle.

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  • Originally Aired September 27, 1999
  • Runtime 25 minutes
  • Network Discovery Science
  • Created December 14, 2012 by
    Administrator admin
  • Modified December 14, 2012 by
    Administrator admin