An ancient civilization that disappeared from the dense cloud forests of eastern Ecuador 1,500 years ago likely wasn’t obliterated by a massive volcanic eruption, as had previously been suggested. Instead, the mysterious culture appears to have gradually declined for reasons unknown, raising a number of questions as to what went on during the so-called "Lost City" of the Amazon’s final years. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Located in the Upano Valley, where the tropical Andes slope towards the Amazon rainforest, the archaeological site contains over 7,000 structures connected by a series of roads and causeways, and is larger than Machu Picchu . Radiocarbon dating has suggested that the ancient city was first occupied

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