![](https://image.tmdb.org/t/p/original/cMorBXaVfZGhR11Yq9DTy2CjEnR.jpg)
Millau Bridge - S2.E5
Richard uncovers why an ancient Celtic boat-building technique was crucial to the development of the tallest road bridge in the world.
Millau Bridge - S2.E5
October 5, 2009
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