Delta offers a RTW fare, but it is limited to 6 stopovers and no more than 3 on the same continent. It seems like a good deal, but I wonder if you could build a better trip using multiple open jaw with stopover trips linked together. That would remove the limitations and probably get you a better deal.
http://www.delta.com/skymiles/use_mi...orld/index.jsp

OP, if you weren't aware, Delta allows you to book a stopover and an open jaw into your award ticket. Open jaw means you book a round trip ticket, but your initial and final city are different. For example you could fly JFK to Moscow, then from Moscow to Vienna. Stopover means that you "stop over" for an extended period of time at one of your connection cities. For example if you booked a ticket from JFK to Vienna with a layover in Paris, you could set up a stopover in Paris where you stayed for a couple nights and the ticket would still be considered a single JFK-BCN ticket (and not two separate tickets/trips).

See this Points Guy post about Delta open jaws and stopovers: http://thepointsguy.com/2011/06/maxi...-delta-awards/

Now combine the two and you can get quite a trip. You could build the trip yourself this way and book it as 3 individual awards which should yield 9 destinations. You'll have to take the time to look up valid routing and destinations, and check out availability.