Currently available on 1 streaming service.

Streaming, rent, or buy How Did They Build That? – Season 2:

Currently you are able to watch "How Did They Build That? - Season 2" streaming on Smithsonian Channel Amazon Channel.

Where can I watch How Did They Build That? for free?

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.