Archaeologists in Mexico have found 4926 cave paintings in the north-eastern region of Burgos.
The images in red, yellow, black and white depict humans, animals and insects, as well as skyscapes and abstract scenes.
The BBC reports they were found in 11 different sites in the Sierra de san Carlos mountain range.
The walls of one cave were covered with 1550 scenes.
Experts hope to chemically analyse the paint to find out the approximate age of the paintings.
The area where they were found was previously thought not to have been inhabited by ancient cultures.
Archaeologist Martha Garcia Sanchez said that very little is known about the cultures who dwelled in Tamaulipas.