http://www.pointlesswasteoftime.com/games/wowworld.html

The only problem with this is that the entire human race would die out about 100 years after it started.

Sort of, yeah...

My kinda dream is building a gigantic park of DND. You and your party will go through an adventure and stuff, while dms gonna build the adventure and maintain it.

This idea was actually written in a book, and cought me. The book's called (translation from hebrew, though it is not originally in hebrew) "Dream Park".

(Seems its famous, but no time to post links)

Edit: Yes, it's called Dream Park in english as well, and a very good book, btw :)

Dream Park by Larry Niven and Steven Barnes