![Mysterious rock art uncovered in caves on Caribbean island (1/4)](http://www.ecns.cn/hd/2017/11/02/7ca98f68589f4eba9668a60ddb77c32c.jpg)
Experts have uncovered a vast array of mysterious pre-Columbian rock art in the caves of a remote uninhabited Caribbean island. Archaeologists explored around 70 cave systems on Puerto Rico’s Mona island. The thousands of designs, created centuries ago, comprise the largest concentration of indigenous pre-Columbian rock art in the Caribbean, according to experts. (Photo/VCG)