Archaeologists have discovered a lost Mayan city in the jungles of southeastern Mexico.
The city in Campeche province on the Yucatan peninsula was found to have pyramids and palaces never before seen by researchers.
The site is 54 acres and may have been from the Late Classic Maya period from about 600 to 900 AD.
At that point, Mayan civilization was already in decline and collapsed shortly after due to climate change, demographics and warfare.
Researchers found a site with three large comlexes and ruins of pyramids, the largest being 75 feet tall.
They also found the remains of homes, altars, ball game courts and plazas.
"It is one of the largest sites in the Central Lowlands, comparable in its extent and the magnitude of its buildings with Becan, Nadzcaan and El Palmar in Campeche," said rchaeologist Ivan Sprajc of Mexico's National Institute of Anthropology and History, in a statement.
The site was initially found using aerial images that showed architectural remains.
The images had been taken by the National Commission for the Knowledge and Use of Biodiversity 15 years before to monitor a nature reserve.
After they were spotted, researchers spent three weeks clearing the jungle towards the site, which they then spent six weeks mapping.
More research needs to be done on how this site was connected to others in the area and what exactly it was used for.
The Maya were one of the most sophisticated pre-Columbian tribes, with a civilization spanning from modern-day Mexico throughout the length of Central America.