Do you know what a Round The World airfare is? One ticket, up to 15 segments, on 14 major air carriers. Its good for a year. So pretty much you just get on any flight from a member carrier to go pretty much anywhere you want. The Star Alliance has a majar air carrier that covers every region of the world. Its pretty amazing. Im getting conflicting price information though. Ive seen prices of $2200 and a link below that seems up to date for $5640.

http://1st-air.com.sg/world/fares_star.html http://www.star-alliance.com/isroot/SA/htmen/8_0.htm