North America --- USA, Canada, various islands in the Caribbean
Europe --- UK, Spain, France, Germany, Switzerland, Austria, Luxembourg, Greece, Netherlands, Turkey (just Istanbul, but I was on the European and Asian sides)
Africa --- Egypt
And I'm posting from Asia right now (I'm in Ho Chi Minh City, Vietnam) in the middle of a 7-month long trip across the continent.

South Korea, Japan, China, Thailand, Laos, Vietnam, and in the next 2 1/2 months add Cambodia, India, and Nepal.
Hoping for a trip to South America next summer to visit a friend in Brazil, and Oceania is always at the top of my travel wish list. As for Anarctica...how do you go about getting there? Are there private companies that fly there or something, or do you have to be a scientist?