Webarchaeologists working deep in the amazon rainforest have discovered an extensive network of cities dating back 2,500 years. Weba huge ancient city has been found in the amazon, hidden for thousands of years by lush vegetation. The discovery changes what we know about the history of. Webdeep in the amazon rainforest in the south american country of ecuador, an ancient city lay hidden for thousands of years. But after 25 years of careful research, its.