A new study published in the journal Proceedings of the National Academy of Sciences has revealed that a series of mysterious lines and geometric shapes carved into the Amazonian landscape were created thousands of years ago before the rainforest even existed, according to a report in Discovery News. The purpose of the massive earthworks and who created them remains unknown, and scientists are beginning to realise just how much there still is to learn about the prehistoric cultures of the Amazon and life before the arrival of Europeans. – See more at:
Fonte: The Ancient Origins
La mia modestissima opinione è che possa trattarsi di strutture abitative o rituali, di cui è rimasto solo il solco in cui venivano costruite le fondamenta e le pareti.