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Wells Cathedral: How the cathedral was saved from collapse

12 August 2014 Last updated at 20:16 BST

As part of 150th anniversary celebrations for the Clifton Suspension Bridge in Bristol, BBC Points West is exploring some of the other engineering marvels in the west country.

Science author and broadcaster Jheni Osman has chosen her five favourites and has been discovering how, in the 14th Century, Wells Cathedral was saved from collapse.