"Drift down this Liquid Rainbow," reads the clue at the Lost City. In Colombia, you know that could only mean what river?

Colombia's Caño Cristales – or "River of Five Colors" – is a piece of natural magic. The water's purples, reds, greens, and yellows make for a rainbow (again, created by algae). Will you find your pot of gold at the end of this rainbow? Not yet.

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