It's all been said including about the guy sat in seat 61 (which is an amazing resource).
Just get out there and see/enjoy the world without the additional complexity and cost of mechanical devices (with the possible exception of a pedal cycle, but you can pick up one of those on your travels).
I started travelling by hitch-hiking; I am not sure that it is quite as easy nowadays because major highway rules don't permit it, in general; but they didn't back in the days when the French police "threw" me off their autobahn!!
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Dave
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