In the US and in no particular order, my top 11 (sorry, couldn't make it 10) are:
CC York *
Sunnehanna *
Oakmont *
Friars Head
Garden City GC
Maidstone
Fishers Island
Newport *
The CC, Pepper Pike *
Pepper Pike Club *
Chicago GC
* will see this year
I chose CC York, because it is a Ross design with what I am told are the greatest Ross greens in PA and that is saying something. Also Flynn lost out in this competition to Ross.
Sunnehanna is a classic course that was remodeled by Flynn and holds one of the preeminent amateur events annually.
Oakmont. No need to say anymore.
GCGC, Maidstone, Fishers Island, and Newport for their timeless design and history. Friars Head to see another C&C classic in the making.
TCC, Pepper Pike and Pepper Pike Club to visit two Cleveland area Flynn's. TCC is holding the 2nd annual Flynn Invitational. I'll also visit Elyria in western Cleveland.
Chicago GC because of its history and design. A tour player and designer was trmendously impacted by this course and is reflected in a design that he did. I'd like to see for myself how good it is.