The Amazon has a vast jungle basin, breathtaking waterfalls, and the world's largest river dolphins, but it might be more remarkable for something it doesn't have: a single bridge. The Amazon is the world's longest river not crossed by any bridges.

The reason for the lack of bridges is that the Amazon Basin has very few roads for bridges to connect. The dense rainforest is sparsely populated outside of a few large cities, and the river itself is the main highway for those traveling through the region. Macapá, on the north shore of the Amazon delta, is a city of half a million people, but there's not a single road to connect it to the rest of Brazil.

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