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In this June 15, 2017 photo, a visitor rides a bicycle along the Han river in Seoul, South Korea. In a country where bikes are either a poor man’s transportation or a weekend workout for spandex-clad racers, the longest and most highly engineered network of car-free paths in the world is being built through dense evergreen forests, down wildflower-lined river valleys and over steep mountain crests. (AP Photo/Lee Jin-man)

In this June 15, 2017 photo, a visitor rides a bicycle along the Han river in Seoul, South Korea. In a country where bikes are either a poor man’s transportation or a weekend workout for spandex-clad racers, the longest and most highly engineered network of car-free paths in the world is being built through dense evergreen forests, down wildflower-lined river valleys and over steep mountain crests. (AP Photo/Lee Jin-man)

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