Chichén Itzá is a Maya city in the north of Mexico's Yucatán Peninsula that flourished between roughly 800 and 1200 CE and became the most powerful capital in the northern Maya lowlands. Its best-known monument, El Castillo (the Temple of Kukulcán), is a stepped pyramid with 365 steps that hides two earlier pyramids and sits above a water-filled cenote. Archaeologists attribute the city to the Maya, with strong artistic influence from central Mexico.
The site matters because several big questions meet there: how the Maya tracked the sky, how far ideas travelled across Mesoamerica, and how much of the popular story is ancient rather than modern. It is a UNESCO World Heritage Site since 1988, and since 2007 one of the New Seven Wonders of the World. This guide sets out what the evidence shows, where scholars still disagree, and how Billy Carson reads the site.
Where and when was Chichén Itzá built
Chichén Itzá lies in the dry limestone plain of north-central Yucatán, a landscape with no rivers, where water comes from cenotes, natural sinkholes that open onto the groundwater. The name reflects that: it is usually translated as "at the mouth of the well of the Itzá," after the Maya group associated with the city.
People were settled there by around the sixth century CE, but the city's great age came later. Most of its monumental building belongs to the Terminal Classic and Early Postclassic periods, roughly 800 to 1200 CE, and between about 900 and 1050 it expanded into a regional capital controlling much of north and central Yucatán. By the thirteenth century it had been eclipsed by Mayapán.
Who built Chichén Itzá: the Maya and the Tula question
Chichén Itzá was built by the Maya. That is the consensus of archaeology, and nothing found at the site points to outside builders. What scholars have argued about for a century is why so much of the later city looks central Mexican.
Buildings such as the Temple of the Warriors closely resemble Temple B at Tula, in the modern state of Hidalgo, the capital associated with the Toltecs. Both have colonnades, feathered-serpent columns and reclining Chac Mool figures. Early Mayanists such as Alfred Tozzer explained this as a Toltec invasion of Yucatán. Later work complicated that picture. Radiocarbon dates suggest the "Maya" and "Mexican" styles at Chichén Itzá overlapped in time rather than following one another, and some researchers argue the influence ran in both directions. The essays collected in Twin Tollans, edited by Jeff Karl Kowalski and Cynthia Kristan-Graham, lay out the range of views. The precise relationship is unresolved, but the builders were Maya taking part in a wider Mesoamerican world.
El Castillo: the Temple of Kukulcán and what is inside it
El Castillo is a square, stepped pyramid of nine terraces, about 55 metres along each side at the base and roughly 30 metres high including the temple on its summit. A stairway climbs each of its four faces. Each has about 91 steps, and adding the top platform as a final step gives 365, the number of days in the Maya solar calendar, the Haab'. Most researchers date the outer pyramid to roughly the tenth or eleventh century CE.
Like many Mesoamerican temples, it was enlarged by encasing older ones. In the 1930s excavators tunnelled in and found an earlier temple inside, holding a Chac Mool and a jaguar throne painted red and inlaid with jade. In November 2016, a team led by geophysicist René Chávez of the National Autonomous University of Mexico (UNAM) and INAH archaeologist Denisse Argote announced that electrical resistivity tomography, a method that maps buried structures by passing weak currents through the ground, had revealed a third, still smaller pyramid about 10 metres tall inside the second. The team placed this innermost structure in the Late Classic period, before about 800 CE. The press called it a "Russian doll" pyramid: three phases nested one inside the next.
The same research group reported in 2015 that El Castillo stands above a cenote, estimated at about 25 by 35 metres and around 20 metres deep. No archaeologist has entered it. Since cenotes were treated as entrances to the underworld, many researchers think the location was chosen deliberately.
Does the equinox serpent really appear
Yes. In the late afternoon around the spring and autumn equinoxes, the stepped edges of the pyramid cast a row of seven triangles of light and shadow onto the side of the northern stairway, joining a carved serpent head at its foot. Large crowds gather to watch this body of light descend the stairs each March.
Whether the Maya designed it as an equinox marker is a separate question. The pattern is visible for days on either side of the equinox, not on a single day. Archaeoastronomers Ivan Šprajc and Pedro Francisco Sánchez Nava have argued that the equinox was not a meaningful date in Mesoamerican calendars and that the building's orientation fits other solar dates better; they regard the "equinox serpent" as largely a modern reading. Others maintain that light-and-shadow effects of this kind were intended. Either way, the carved serpent heads and the dedication to Kukulcán make a descending serpent a fitting image for the building.
The Great Ball Court, the Temple of the Warriors and the Tzompantli
The Great Ball Court is the largest known in ancient Mesoamerica, measuring about 168 by 70 metres. Players kept a heavy rubber ball in play without using their hands, and stone rings are set high in its side walls. Carved panels along the base of the walls show a ball player being decapitated, with streams of blood turning into serpents and plants, which ties the game to sacrifice and fertility.
The court is also known for its sound. A voice at one end can be heard clearly at the other, and clapping produces a strong flutter echo. Acoustician David Lubman and others have studied these effects; whether they were designed or are a byproduct of two long parallel walls is still debated.
The Temple of the Warriors is a stepped platform fronted by rows of columns carved with warriors, with a Chac Mool at the top of its stairway and the Group of the Thousand Columns stretching out beside it. Nearby, the Tzompantli, or skull platform, is a low structure whose walls are carved with rows of skulls on posts. Skull racks are a feature of central Mexico, and this one is among the clearest signs of central Mexican influence at the site.
El Caracol and Maya astronomy
El Caracol, "the snail," is a round tower on a platform, named for the spiral stair inside, and it has long been called an observatory. It is usually dated to around 906 CE. In a 1975 paper in Science, Anthony Aveni, Sharon Gibbs and Horst Hartung reported that sight lines through its surviving windows and the platform's orientation match several astronomical events, including the northernmost and southernmost setting points of Venus.
Venus mattered to the Maya. The Dresden Codex, one of the few surviving Maya books, contains a detailed Venus table based on the planet's roughly 584-day cycle, and Maya astronomers knew that five Venus cycles equal eight solar years. Part of the upper tower has collapsed, so some alignments can no longer be tested, but the building was very likely used for watching the sky, Venus in particular.
The Sacred Cenote and what was found in it
The Sacred Cenote, or Cenote Sagrado, is a large natural sinkhole north of El Castillo, linked to the main plaza by a raised causeway. It was a place of offering and of sacrifice. The Franciscan bishop Diego de Landa recorded in the sixteenth century that people were thrown into it alive in times of drought, as offerings to the rain god.
Between 1904 and 1910, Edward Herbert Thompson, the American consul in Yucatán,, who had bought the hacienda that included the ruins, dredged the cenote and later dove into it. He recovered gold and copper objects, jade, copal incense, pottery, textiles and wood, along with human remains. Much of it went to Harvard's Peabody Museum. INAH-led expeditions in the 1960s recovered more. The human remains from the cenote include both men and women, and many children.
A 2024 study in Nature, led by researchers at the Max Planck Institute for Evolutionary Anthropology with Mexican colleagues, analysed ancient DNA from 64 young individuals buried in a chultún, an underground chamber near the Sacred Cenote found in 1967. All 64 were boys. The burials span the seventh to twelfth centuries, mostly between 800 and 1000 CE, and the team found two pairs of identical twins and many close relatives. The authors connect this to the Hero Twins of Maya myth, who descend to the underworld, die and rise again.
Kukulcán, Quetzalcoatl and the "white bearded god" claim
Kukulcán is the Yucatec Maya name of the feathered serpent, the same deity the Nahuatl-speaking peoples of central Mexico called Quetzalcoatl. Both names combine a precious bird and a serpent. In central Mexican tradition, Quetzalcoatl was also a priest-king of Tula who was driven out and travelled east.
Landa's sixteenth-century account, in the William Gates translation, says that a lord named Kukulcán "came from the West," ruled with the Itzá at Chichén Itzá, founded Mayapán, and then returned to Mexico, where he was regarded as the god Quetzalcoatl. It is a main source for the idea of a foreign teacher arriving in Yucatán.
The popular image of Quetzalcoatl as a pale, bearded god whose return the Aztecs expected comes from later sources. Historian Camilla Townsend, in her 2003 article "Burying the White Gods," argues that the story of Moctezuma mistaking Hernán Cortés for a returning Quetzalcoatl appears only in post-conquest Spanish and colonial writings, decades after the events. The "white" god is not found in pre-conquest sources and remains contested.
Billy Carson's reading
Billy Carson reads Kukulcán and Quetzalcoatl as later names for one figure he places across the ancient world: Thoth, the Egyptian Tehuti. In his account, Thoth is the same being the Sumerian texts call Ningishzida, and he is the brother of Marduk, whom Carson identifies with Amun-Ra. The brothers clashed over humanity, Thoth wanting to educate people and Marduk regarding them as little more than animals. Carson's telling has Thoth sent away from Egypt and across the planet to found new civilizations, arriving in Mesoamerica with Olmec companions from Africa. He also names Viracocha in the Andes as the same figure, which is why he lays out the thesis most fully in his talk on Peru, Sacsayhuamán and the Anunnaki.
The second strand is alignment. Carson treats the layouts of Giza and Teotihuacan as mirroring Orion's Belt, and reads the match as evidence of one shared tradition rather than coincidence. In that view, the feathered serpent at Chichén Itzá is a memory of the same teacher, and the later Maya were stewards and inheritors of that knowledge. His podcast episode Secrets of Mexico and Thoth AKA Tehuti of Egypt, recorded ahead of a tour through Chichén Itzá, Uxmal, Cobá, Tulum and Teotihuacan, frames the trip as a chance to compare the iconography in person.
This is Carson's interpretation. Mainstream archaeology holds that Chichén Itzá was built in stages by the Maya, documented by its construction sequence, its sculpture and its inscriptions, and that Mesoamerican and Egyptian pyramids developed independently thousands of years apart. Readers can compare the evidence across sites in the guide to pyramids around the world.
Watch, read and go deeper
Hugh Newman's Megalithic Mysteries series on 4BK TV explores ancient stone sites and the questions they raise on screen. For recent finds at the site, read about the serpent warrior head sculpted at Chichén Itzá, a warrior in a feathered-serpent helmet found in the Casa Colorada area during 2023 excavations, and the opening of Chichén Viejo to the public. The Anunnaki and Sumer topic hub gathers Billy's work on ancient origins, and the 4biddenknowledge tours page lists his guided trips to sacred sites.
Frequently asked questions
How old is Chichén Itzá?
People lived at Chichén Itzá from around the sixth century CE, but most of its great buildings date from about 800 to 1200 CE. The outer El Castillo pyramid is usually dated to the tenth or eleventh century. The earliest of the pyramids inside it is thought to be older, from before about 800 CE.
Why does El Castillo have 365 steps?
Each of the pyramid's four stairways has about 91 steps, making 364, and the summit platform counts as the last step, giving 365. That matches the days of the Maya solar year, the Haab'.
What is Chichén Viejo?
Chichén Viejo, "Old Chichén," is a section in the southwest of the site also known as the Initial Series Group. It has about 25 structures arranged around two plazas on a walled platform. INAH opened it to visitors in September 2023 after years of restricted access.
Were people sacrificed at the Sacred Cenote?
Yes. Diego de Landa recorded the practice in the sixteenth century, and dredging and diving since 1904 have recovered human remains of men, women and children alongside offerings of gold, jade and incense. A 2024 DNA study of a separate underground chamber near the cenote found that the 64 young people buried there were all boys, including two pairs of identical twins.
Is Kukulcán the same as Quetzalcoatl?
Kukulcán is the Yucatec Maya name for the feathered serpent deity that the Aztecs and other Nahuatl speakers called Quetzalcoatl. The idea of a white, bearded Quetzalcoatl comes from Spanish-era writings and is disputed by historians.
Sources and further reading
- Jeff Karl Kowalski and Cynthia Kristan-Graham, eds., Twin Tollans: Chichén Itzá, Tula, and the Epiclassic to Early Postclassic Mesoamerican World (Dumbarton Oaks, 2007)
- Diego de Landa, Yucatan Before and After the Conquest, translated by William Gates (1937)
- Anthony F. Aveni, Sharon L. Gibbs and Horst Hartung, "The Caracol Tower at Chichen Itza: An Ancient Astronomical Observatory?", Science (1975)
- Anthony F. Aveni, Skywatchers (University of Texas Press, 2001)
- Ivan Šprajc and Pedro Francisco Sánchez Nava, "Equinoxes in Mesoamerican Architectural Alignments: Prehispanic Reality or Modern Myth?" (2013)
- Rodrigo Barquera, Oana Del Castillo-Chávez, Kathrin Nägele, Johannes Krause and colleagues, "Ancient genomes reveal insights into ritual life at Chichén Itzá," Nature 630 (2024)
- Camilla Townsend, "Burying the White Gods: New Perspectives on the Conquest of Mexico," American Historical Review 108, no. 3 (2003)
- UNESCO World Heritage Centre, "Pre-Hispanic City of Chichen-Itza"
