Amazon Rings
Unexplained Mysteries - Un pódcast de Spotify Studios
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A series of ring-shaped ditches can be found throughout the Brazilian Amazon, which predate the rain forest itself. These structures remain a complete mystery, and archaeologists are unsure what to make of them. It is suggested that they served as burial grounds or a form of defense, but no one knows for sure. Learn more about your ad choices. Visit podcastchoices.com/adchoices