New research has revealed the clean-water secret of Classic Maya reservoirs

Archaeologists at the pre-Hispanic site of Palenque discovered the finely carved artefact, believed to be at least 1,100 years old

With first leg of controversial $20bn Maya Train project set to begin operation, authorities have stepped up excavation and development of archaeological destinations

Guatemalan law prohibits the export of such artefacts for exhibition, local culture organisations say

The elaborate temple relief, now held by the Museo Nacional de Antropología, was extracted from the Maya jungle in the 1960s and offered to the Met for $400,000

The stelae, on loan from Guatemala, feature life-sized depictions of ancient Indigenous leaders