A photograph released to Reuters on August 22, 2014 shows the remains of an ancient Mayan city in Lagunita May 30, 2014. Archaeologists have found two ancient Mayan cities hidden in the jungle of southeastern Mexico, and lead researcher Ivan Sprajc, an associate professor at the Research Center of the Slovenian Academy of Sciences and Arts, says he believes there are “dozens” more to be found in the region. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows a piece of a stela from an ancient Mayan city in Lagunita May 17, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows a piece of a stela from an ancient Mayan city in Lagunita May 17, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows a chultun, an underground chamber for the collection of rainwater inTamchen May 5, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows a piece of a stela from an ancient Mayan city in Lagunita May 18, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows a piece of a stela at an Mayan city in Tamchen April 6, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows the remains of an ancient Mayan city in Lagunita May 30, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows a piece of a stela from an ancient Mayan city in Lagunita May 17, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows the remains of an ancient Mayan city in Tamchen April 15, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows a piece of an altar from an ancient Mayan city in Lagunita May 18, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)

A photograph released to Reuters on August 22, 2014 shows the remains of an ancient Mayan city in Lagunita May 13, 2014. (Photo by Reuters/Research Center of the Slovenian Academy of Sciences and Arts)