This documentary has exclusive access to the startling results of a massive research project that is revealing an ancient hidden civilisation in the jungles of Central America and transforming what we thought we knew about the Maya. The Guatemalan jungle is one of the last great frontiers of archaeology. It's a tough and remote place to work in, and the sheer challenge of excavation has kept many remains of the ancient Maya civilisation who lived there hidden from view. Their spectacular ancient cities are pin-pricks in the dense jungles of Guatemala and Mexico. But now archaeologists have an extraordinary 'treasure map' of the Maya world. A cutting-edge aerial survey has made over 60,000 new discoveries that are astounding archaeologists. According to archaeologist Tom Garrison, this is the greatest advance in our understanding of the Maya in over 100 years, and it's being used alongside the latest in-ground archaeology, while complex Mayan inscriptions are also being deciphered.