Archeologists Victoria Rojas (front) and Lara Hindersten (back) work at a site at the village of Tahtzibichen in Merida, Yucatan Peninsula, April 12, 2008.

Mexican archeologists have discovered a maze of stone temples in underground caves, some submerged in water and containing human bones, which ancient Mayans believed was a portal where dead souls entered the underworld.

Archeologists say Mayans believed the underground complex of water-filled caves leading into dry chambers -- including an underground road stretching some 330 feet (100 meters) -- was the path to a mythical underworld, known as Xibalba.

Picture taken on April 12, 2008. REUTERS/Team of investigators/Tammara Thomsen/Handout (MEXICO).

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