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Ancient Amazon Civilization Developed Unique Form of 'Garden Urbanism'
https://www.scientificamerican.com/article/ancient-amazon-civilization-developed-unique-form-of-garden-urbanism/
Traces of an ancient civilization that had a unique urban infrastructure with cities set amid fields have been rediscovered in the Amazon
Incredible find in the Amazon - a network of roads and cities that would have housed a civilization at least as large as the Mayans. ~6000 mounds, population in the 10,000s or potentially 100,000s, all around the same time period as the Romans.