Caño Cristales

Known as the most beautiful river in the world, Caño Cristales, located in Serrania de La Macarena, Columbia, is unique among rivers. Most of the year the river looks just like any other. However, for a few weeks in October and early November, the river turns into a rainbow of various algae and moss that coat the water's surface with red, green, blue, yellow, and many more colors.

While Caño Cristales is not accessible by road, there are a number of Colombian tourist agencies that host tours of the area. The best way to get there is to take a tour starting in the town of La Macarena.