The most similar thing I've seen are "Round the World Fare" where you buy a ticket that includes a number of other tickets. Then you fly from where you are to anywhere in the world using the number of tickets you got.
check it out here
http://www.oneworld.com/ow/air-travel-op...orld-fares
check it out here
http://www.oneworld.com/ow/air-travel-op...orld-fares