One thing I've always been curious about was Da Vinci's Vitruvian Man... that dude standing with arms wide open. Da Vinci was one hell of a illustration, and did an amazing job drawing perfect anatomy sketches that live up to our days, inspiring illustrators today.
Another day I was taking a look at DeviantART and found two illustrations of these that just caught my attention (the last two).... and I just had to make a post for this awesome Vitruvian Man. Kudos to Da Vinci for such a great inspiration and for his work. I really recommend you to visit each artist's page for more of their work, it's really worth it! Hope you enjoy these. Cheers! ;)