Even if it involves no flying it deserves mention here. An extraordinary Guinness Book of Records achievement.
Graham Hughes managed to visit every country in the world using public transport or on foot, and without flying :
The Odyssey Expedition
Quote:
My name is Graham Hughes. I'm an adventurer, film-maker, travel blogger and TV presenter from Liverpool, England. On January 1 2009 I crossed the River Plate into Uruguay and began The Odyssey Expedition: The first official Guinness World Record™ attempt to visit every sovereign state on Planet Earth without flying.
That's the 193 members of the United Nations plus Taiwan, Vatican City, Palestine, Kosovo, Western Sahara and the four home nations of The United Kingdom. A staggering 201 international borders crossed by foot, bus, taxi, train, ship or canoe. No planes, no helicopters and no hot-air balloons.
Along the way I self-filmed and presented the TV show Graham's World for the National Geographic Adventure channel and raised funds for the registered charity WaterAid.