Asia: I've already been to Laos, which was my goal, but if I could get a visa for Nepal I'd kill for it. But they're rare and kinda tough.
Europe: Probably Switzerland for the high Alps. Or go back to Netherlands, that was a good time.
Africa: Kenya. I'd love to see the Maasai Mara in person.
North America: I've already been to America, Canada, and Mexico, but if I had to pick one to go back to, Canada. I've been to Montreal, but visiting Nunavut or the NW territories would be cool.
South America: Ecuador. Or Peru. I want to get to the Andes, this is actually my next travel goal.
Australia: I want to snorkel the Great Barrier Reef. Maybe it doesn't count because it's not on land, but that's what I would be most interested in there.
Antarctica: ANYWHERE I could get to in Antarctica would be a privilege. I'm not choosy, if I ever get a chance to go, I am there with wings on.