Beeing an iranian engineer myself I recommend you by heart watching this fascinating professionaly made documentary on old Persia’s engineering achievements:
Just start with Part 1 (very short) and continue with the other parts if you like it. The documentary just gets better and better.
Enjoy, and share.
Part 1/5:
Part 2/5:
Part 3/5:
Part 4/5:
Part 5/5:
The other Iran 
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I’ve only seen Part 1 so far, but it is so good that I want to see the rest when I have time. Thank you for an excellent production!
Well this is from British TV, but it is really excellently made and my favorite history series. It also covers other cultures.
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