Part 1 (the ugliest historical helmets): https://www.youtube.com/watch?v=UFv0iP5Ggp8
The Knyght Errant's video on the difference between an armet and a close helmet: https://www.youtube.com/watch?v=42oEPWVGNBw
There are lots of beautiful, intricate, effective and/or badass helmet designs from all over the world. These are just the ones that I happen to like the most, mainly due to aesthetics but also functionality.
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My second channel (for gaming, rants, vlogs, etc):
https://www.youtube.com/channel/UCf6CpA3RvKibY4fMQ60SyoA
My favorite online store for buying swords (worldwide shipping):
http://ww4.aitsafe.com/go.htm?go=kultofathena.com&afid=28632&tm=14&im=1
Some recommended knife makers on Amazon:
http://amzn.to/1qjwMNL