I'm not well travelled.  I've never been to Australia or Antarctica.  I've only seen pieces of the world outside the US.
Inside the US I've travelled extensively.  The last state for me to pilot a motor vehicle in was Oregon, which I accomplished at the ripe old age of 23.
For a visual representation of most of the places I've worked you can visit my GoogleMap.
Places I've visited but not had the pleasure of working in include:

Courtmacsherry, Ireland
Singapore
Bangkok, Thailand
Kuala Lumpur, Malaysia
A few of the border towns in Mexico and Canada.

Here's a list of  some of the foreign lands I've worked in.  Where I've written some work oriented travel tips I've included a hyperlink.

Canada (Alberta Province)
Bintulu, Sarawak, Malaysia
Shanghai, China
King's Lynn, England
Dashouz, Turkmenistan
Milan, Italy
Venezula (Punto Fijo, Isla Margarita, Maracaibo)
Algeria (Southern)
Constanta, Romania

Before I cast off this mortal coil I want to have set foot on all 7 continents.  Australia shouldn't be a problem, but I'd imagine it's not easy to get an assignment in Antartica unless you're in a research field.