Mexico's Yucatan Peninsula is littered with thousands of mysterious caves that once served as a haven for prehistoric people and later became a sacred Mayan sacrifice.
Researchers of the Gran Acuifero Maya (GAM) Aquifer Discovery Project have discovered the world's largest underground cave system called Sac Actun in the Yucatán Peninsula
Around the beginning of the 16th century, the invaders from Spain were the ones who discovered Kukulkan temple in Mexico's Chichen Itza ruins.
Archaeologists find the largest underwater cave in the waters off the southeastern Yucatan Peninsula of Mexico, the International Business Times reported on January 17.