Man at Arms is a YouTube show in which real-life weapons from movies and TV shows are recreated. Recently they made the Bride’s Hattori Hanzo sword from Kill Bill. They started from scratch by building a furnace from before the Edo period (before 1603) to smelt the iron ore.

I know zero about swords, but it looks like these guys really did their homework in making as close to a traditional katana blade as they could. (via devour)