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Currently you are able to watch "How Did They Build That? - Season 2" streaming on Smithsonian Channel Amazon Channel.
There are no options to watch How Did They Build That? for free online today in Canada. You can select 'Free' and hit the notification bell to be notified when season is available to watch for free on streaming services and TV.
Witness amazing buildings, bridges, lifts, and other structures that pushed structural concrete engineering to the edge.