Calakmul Maya ruins in Mexico's Campeche state. The pyramid here stands 148 feet (45 meters) high, and is one of the largest known Maya structures remaining. #

Aerial view of a beach in Mexico's state of Quintana Roo on January 17, 2018 #

A green sea turtle swims over a coral reef near Akumal, south of Cancun, Mexico. #

A couple sits on the rocks in Cenote Aktunchen in Quintana Roo. #

Flamingos stand in the waters of a wetland reserve in Celestun, in Mexico's Yucatán Peninsula, on December 6, 2011. #

Flamingos fly over a wetland reserve in Celestun on December 6, 2011. #

The restaurant district in Isla Mujeres, near Cancun, on September 27, 2018 #

The Magician's Pyramid at the ruins of the ancient Maya city of Uxmal #

A bird's-eye view of the Oval Palace at the Maya excavation of Ek Balam, near Valladolid, Mexico #

A woman stands on the steps of Nohoch Mul ("Great Pyramid") at Coba, a Maya archaeological site. #

A close-up view of the structure of a leaf in a Mexican forest on the Yucatán Peninsula #

Looking toward the shore near Cozumel, Mexico #

El Castillo Maya structure, as seen from the Caribbean Sea, at the Tulum archeological site in Quintana Roo #

A nighttime thunderstorm over Tulum #

Jonathan Paredes of Mexico dives from the 27-meter platform during the seventh and final stop of the Red Bull Cliff Diving World Series in Ik Kil Cenote. #

The interior of Suytun Cenote, photographed in July 2015 #

Bubbles rise from water plants in a cenote in the Riviera Maya, south of Cancun. #

Divers enter the impressive entrance of Carwash Cenote near Tulum, Quintana Roo. #

A view of the Maya ruins of Ek Balam in the Yucatán Peninsula, Quintana Roo, Mexico #

A Mexican man wearing a pre-Hispanic costume walks next to the Kukulkan Pyramid at the Chichen Itza archaeological park in Yucatán, Mexico, on December 20, 2012. #

Aerial view of Tulum's beach and jungle #