I have crossed all the continents, bar the Antarctic, from coast to coast, on land and water-based public transport.
South America was east to west to east in the previous millennium.
Now a tip to tip ramble, bottom's up, from Tierra del Fuego, north.
For a glimpse of two years across Asia and Africa, see (not available on mobile devices)
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http://v2.travelark.org/travel-blog/the-rambler/hk_to_cape_town
... full info