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Earthen Rings in the Amazon

Although much of the world's forests have remained unexplored, none are as mysterious as the Amazon jungle. This huge expanse of trees has secrets unlike any other place on earth, and this can be seen when you look at these earthen rings found in the Bolivian and Brazilian Amazon rainforest in 2014. To this day, scientists have no idea what they are or what they mean. But they do know that they were man-made.

Sanna Saunaluoma via Wikimedia Commons

Not only that, but the exploration of this site has also confirmed that these rings were made before the rainforest even existed. This simply adds more questions to the unanswered question pile.