An international team of archaeologists, physicists, and engineers is preparing to investigate what may lie hidden inside one of the most famous Maya monuments. Later this year, researchers will use muography, a non-invasive imaging method, to look for possible hidden chambers and structural layers inside the Maya Pyramid, El Castillo, or the Temple of Kukulcán, at Chichén Itzá in Mexico.
Advanced imaging may reveal sealed rooms
The technology tracks cosmic-ray muons, tiny particles that constantly pass through Earth’s atmosphere and solid stone. By measuring how those particles move through the pyramid, scientists can create detailed internal images.
The results may reveal sealed rooms, unknown passages, or earlier temple layers buried inside the visible structure. The findings may also answer long-standing questions about how the pyramid was built.
A towering symbol with an unknown interior
El Castillo dominates the ceremonial heart of Chichén Itzá. It dates from the eighth to twelfth centuries CE and stands about 30 meters tall, with each side measuring roughly 55.5 meters.
Take a look at this uncommon aerial perspective of the Pyramid of Kukulkán located in Chichén Itzá.
This angle not only showcases the magnificent pyramid, which dates back to around AD 600, but also reveals the pathway that extends from it.
This path culminates at the Sacred… pic.twitter.com/9m0GQK6btR
— 🧬Maxpein🧬 (@maximumpain333) December 18, 2025
Researchers say the pyramid was built in stages, with new temples constructed over earlier ones. That layered design likely created a maze-like interior that specialists still do not fully understand.
Earlier discoveries suggest more secrets remain
Clues of hidden spaces have appeared before. In the 1930s, archaeologists uncovered a tunnel on the pyramid’s northern side. It led to two inner rooms now known as the Offering Chamber and Sacrificial Chamber. Inside, they found a Chac Mool sculpture and a jaguar throne painted red.
Later electrical surveys suggested even more voids inside the pyramid. They also confirmed a water-filled cavity beneath it, likely linked to the region’s sacred cenotes.
New study focuses on confirming and expanding internal discoveries
The new project, led by Mexico’s National Institute of Anthropology and History (INAH) with UNAM and U.S. partners, aims to confirm known chambers and search for others. Two custom muon detectors will be placed in existing tunnels on the north and south sides.
During the first six months, researchers hope to clearly detect the known rooms. If the method proves accurate, they will begin scanning the entire structure for new hidden spaces.
Potential clues to royal burials and ritual use
Some archaeologists believe an earlier temple sealed inside El Castillo may have served as a royal burial, a practice known elsewhere in Mesoamerica. If muography reveals evidence of that function, it would mark a major advance in understanding Maya ritual architecture and royal tradition.
Researchers say the project may help set a new scientific standard. If successful, it will show that muography can safely uncover hidden chambers inside ancient monuments without damaging them. The work could reveal long-guarded secrets while protecting one of the world’s most important archaeological sites.
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