What a great article - it's to the point.

They uncovered the hidden complex - which they have called Valeriana - using Lidar, a type of laser survey that maps structures buried under vegetation.

They believe it is second in density only to Calakmul, thought to be the largest Maya site in ancient Latin America.

The team discovered three sites in total, in a survey area the size of Scotland's capital Edinburgh, “by accident” when one archaeologist browsed data on the internet.

“I was on something like page 16 of Google search and found a laser survey done by a Mexican organisation for environmental monitoring,” explains Luke Auld-Thomas, a PhD student at Tulane university in the US.

Lidar needs to appear an horror movie. Something like this - For a thousand years evil was left undisturbed...