A student has found a lost city in the Mexican jungle "by accident".
The lost Mayan city has temples like Calakmul
Archaeologists have uncovered the hidden Mayan complex - which disappeared under a jungle canopy - using Lidar, a laser survey that can map structures buried underneath vegetation.
The experts have discovered three sites in an area they have called Valeriana but they were found unintentionally after a member of the team was looking for data on the internet.
Luke Auld-Thomas, a PhD student at Tulane University in the US, said: "I was on something like page 16 of Google search and found a laser survey done by a Mexican organisation for environmental monitoring."
He processed the data and was able to spot what other archaeologists had missed in the form of an ancient city that was once home to between 30-50,000 people.
It is believed that the hidden city is second only in density to Calakmul, which is suspected to be the largest Maya site in Latin America.