Since 1963, Jerry Gretzinger has been partaking in a pretty interesting hobby: he’s been making a map. It’s a map of an imaginary world of his own creation. He speaks about it in this video by Gregory Whitmore:
I found the link to the video in /r/Minecraft, and the fact that I found it there goes a long way in describing my appreciation for what he’s doing. I see some parallels in what goes on in Minecraft and what he does.
He’s even got a blog. He really seems to enjoy what he’s doing, and I think he does a great job doing it.