It's reckoned that there's about a billion bikes in the world, twice as much as cars. The bicycle is a truly European invention, but I won't bore you with the details of who and when things were done. However, about half of all bikes are now made in China. Bikes have had major effects on women's emancipation, the environment, poverty, congestion, the military, mail, fitness, delivery, and city planning. And various cities is where this gallery focuses, with some random bike parking. Oh, and one silly fact. The longest "tandem" bike ever was 67 feet long and seated 35 people !

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