Two Beers and a Pretzel

So apparently there is an accepted definition of Circumnavigation: You must pass through two points on the Earth that are exact opposites on the globe (antipodes), then return to the exact place you started your journey.

This is somewhat difficult for the land traveller, since there are few antipodal landmasses. My two best chances at meeting this strict definition will be New Zealand and Spain, or Argentina and China.

Image from the Wikipedia article on Antipodes