A PhD student, Luke Auld-Thomas, found a lost Maya city in the jungle of Campeche, Mexico. The city, named Valeriana, was discovered using Lidar technology, which uses lasers to map structures hidden under trees. This city has pyramids, sports fields, and causeways, and it might have been home to 30,000-50,000 people between 750 and 850 AD.

Auld-Thomas found the city by accident while looking at data online. He said, "I was on something like page 16 of Google search."

The discovery shows that the Maya lived in complex cities, not just small villages. The city was hidden close to a main road, and no one has visited it yet. This finding suggests that many more ancient Maya cities may still be hidden beneath the jungle canopy, awaiting discovery.