This thread has officially killed a good couple of hours of my life, awesome. Just saying this was an awesome idea(especially to sticky), either way I'll put in my contribution.
Images of Our Century - This is a great video of the 1900's. It has been posted on here before but it is well deserving of being posted over and over again.
Rocky Marciano Tribute - My favorite athlete of all time(I'm from Italian heritage so this shouldn't be a big surprise, lol). Either way, he was unreal.