Ohio's Great Serpent Mound was built by the Native American ancestors of today's Indigenous nations, not by the giants, Lost Tribes, or ancient aliens of the debunked 19th-century Mound Builder myth
Where the evidence lands: ContradictedThat the elaborate earthworks and effigies of the Ohio Valley, including the Great Serpent Mound, were too advanced for Native Americans to have created, and were instead the work of a vanished superior people, white Europeans, the Lost Tribes of Israel, Atlanteans, biblical giants, or ancient astronauts, whose civilization was later destroyed by the primitive ancestors of today's Indigenous nations.
Believed by: The scientific and Indigenous consensus that Native Americans built the mounds is universal among archaeologists, historians, and the descendant nations. The lost-race version survives mainly in fringe pseudoarchaeology, ancient-aliens media, and older popular lore; the legitimate Adena-versus-Fort-Ancient dating question is a live, mainstream archaeological debate that is not part of the myth.
The full story
What the mound actually is
Start with the object itself, because it is real and remarkable. The Great Serpent Mound lies in Adams County, Ohio, near the village of Peebles, on a bluff overlooking Ohio Brush Creek. It is an earthen effigy roughly 1,348 feet long and a few feet high, the largest serpent effigy known anywhere in the world. The body winds in deep curves along the ridge, ending in a tightly coiled tail at one end and, at the other, open jaws wrapped around an oval feature that interpreters have read as an egg, the sun, or an eclipse.
It was surveyed and mapped by Ephraim Squier and Edwin Davis in 1846, and their Ancient Monuments of the Mississippi Valleybecame the Smithsonian's first publication. In the 1880s Frederic Ward Putnamof Harvard's Peabody Museum excavated the site and, seeing it damaged by plowing, raised the money to buy and preserve it. Today the Ohio History Connection stewards it as a National Historic Landmark and, plainly, as Native American heritage.
So the question this file weighs is not whether the serpent is impressive or worth wondering about. It plainly is. The question is who built it, and why a false answer to that question took hold for most of a century and still circulates today.
Who built it: the archaeological answer
The mainstream, evidence-based answer is not in doubt at the level that matters: Serpent Mound was built by Native American communities. The effigy sits beside classic Adena burial mounds of the Early Woodland period, which is why early investigators linked it to that culture. Radiocarbon testing in 1991 returned a date of about 1070 CE, pulling many archaeologists toward the later Fort Ancient culture instead. A 2014 reanalysis argued for an Adena origin around 300 BCE, with Fort Ancient repair or rebuilding centuries later.
That back-and-forth is genuine science, and it is worth being clear about its shape. Serpent Mound contains no burials and no diagnostic artifacts inside the effigy, so dating depends on tiny charcoal samples trapped in the soil. Reasonable specialists read that thin evidence differently. But notice what the debate is actually between: Adena and Fort Ancient, an earlier Indigenous society and a later one, or a monument begun by one and renewed by the other across generations of continuous Native reverence.
The real scientific argument is about which Native ancestors built the serpent, and when. It was never about whether Native ancestors built it. They did.
The distance between those two questions is the whole point. Honest uncertainty about the century and the culture is ordinary archaeology. It offers no foothold whatsoever to the claim that someone other than Indigenous people made the mound, and it is a mistake, sometimes an innocent one and sometimes not, to treat it as if it did.
The Mound Builder myth and what it was for
For much of the 19th century, a very different story dominated. The Mound Builder myth held that the earthworks of the eastern United States were too sophisticated for Native Americans and must have been raised by a vanished superior race, imagined by turns as white Europeans, the Lost Tribes of Israel, Phoenicians, Atlanteans, or biblical giants. In every version, that lost people was said to have been exterminated by the primitive ancestors of contemporary American Indians.
This was not idle antiquarian speculation. It rose alongside westward expansion and Indian removal, and it did political work. If a noble lost race had built the mounds and been destroyed by Native people, then dispossessing those same Native people could be recast as reclaiming a heritage rather than seizing a homeland. The myth denied Indigenous achievement and, in the same motion, helped rationalize the theft of Indigenous land. Naming that function is not editorializing; it is the historical record.
The story was dismantled by evidence. Thomas Jefferson had already reached the right conclusion in the 1780s by carefully excavating a mound and crediting Native ancestors. Then, in 1894, Cyrus Thomas of the Bureau of Ethnology published a book-length Smithsonian survey that took the lost-race arguments apart one by one and found, in his words, an unbroken chain connecting the mound builders and the historical Indians. Scholars mark that report as a founding moment of scientific American archaeology.
“An unbroken chain connecting the moundbuilders and the historical Indians.” The lost-race myth was answered on the evidence more than a century ago.
Why the myth still gets told
If the science was settled in 1894, why does the myth survive in 2026? Partly because it is a good story, and a flattering one. Awe at a quarter-mile serpent, combined with unfamiliarity, invites exotic answers, and exotic answers travel. Forged inscribed stones, tall tales of giant skeletons, and, more recently, ancient-astronaut television have each repackaged the same denial as thrilling secret history that a technical report can never match for reach.
There is also a structural reason. Removal severed Indigenous communities from ancestral sites, leaving mounds that looked abandoned to newcomers. The myth then pointed to that engineered silence as proof of its own claim. In that sense the story helped manufacture the very appearance it cited as evidence, a closed loop that is hard to break from the outside.
The modern versions deserve to be named for what they are. When cable programs credit Serpent Mound to Nephilim giants or to visitors from space, they are recycling a 19th-century racial insult in a science-fiction costume. The claim underneath has not changed: that Native Americans could not have built what they demonstrably did build. Native writers and the Ohio History Connection have said as much directly, calling the theories demeaning to Indigenous heritage.
Where the evidence lands
Keep the two things apart. The monument is real and Indigenous: a great serpent effigy raised by Native American communities in the Ohio Valley, stewarded today as heritage and recognized as one of the finest examples of ancient American monumental art. The Mound Builder myth is debunked: the claim that a vanished non-Native race built the mounds is fake history that archaeology refuted well over a century ago, and it carried a racist purpose that the record makes plain.
What remains genuinely open is small and internal to Indigenous history: whether the serpent is the work of the Adena, the Fort Ancient, or both across time, and exactly when it was built and renewed. That is a real debate, and it is not a loophole. It does not reopen the lost-race question, because both answers are Native.
The right posture is to celebrate the mound, credit its builders, and refuse the myth without hedging. Serpent Mound was built by the ancestors of today's Native nations; the giants, Lost Tribes, and aliens are not a rival theory but a debunked one; and the only honest mystery left is which Indigenous ancestors, and which century. Holding those statements together is how you report the wonder of the place without laundering the slur that was told about it.
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What's still unexplained
- Which culture and which century: the honest, still-open scholarly question is whether Serpent Mound is an Adena work of around 300 BCE, a Fort Ancient work of around 1070 CE, or an earlier mound later rebuilt by Fort Ancient people. Because the effigy holds no burials or diagnostic artifacts, dating leans on scarce charcoal samples. This is real archaeology, and every answer is Indigenous.
- What the serpent meant: readings of the effigy's symbolism (a snake with jaws open around an oval that may represent an egg, the sun, or an eclipse, and features aligned to solstice events) remain interpretive and are best informed by the perspectives of descendant Native nations rather than by outside speculation.
- Why the myth persists after more than 130 years of debunking: the open problem is less archaeological than cultural, namely how heritage institutions and Native voices counter a lost-race story that cable pseudoarchaeology and the internet keep recycling to new audiences.
- How the site is best protected and honored: questions of stewardship, Indigenous consultation, and Serpent Mound's bid for wider international recognition are ongoing, and they proceed from the settled premise that this is Native American heritage.
Point by point
The claim: The mounds are too sophisticated for Native Americans to have built, so a vanished superior race must have made them.
What the record shows: This is the false premise at the heart of the myth, and it is contradicted by the entire archaeological record. Indigenous societies across the Eastern Woodlands built earthworks continuously for thousands of years, from Adena and Hopewell burial and ceremonial mounds to the great Mississippian city of Cahokia. Serpent Mound belongs to that documented, homegrown tradition. The premise was never a finding; it was an assumption about Native incapacity, and it is simply wrong.
The claim: No living Native people were connected to the mounds, which proves a different race built them and disappeared.
What the record shows: The apparent disconnect was largely manufactured by removal and by the myth itself. Forced relocations tore Indigenous communities from their homelands, and the lost-race story then treated the resulting absence as evidence. Cyrus Thomas's 1894 survey found continuity, not rupture: an unbroken chain linking the mound builders to historical Native nations, many of whom retained cultural ties to these sites.
The claim: Serpent Mound's precise astronomical alignments show engineering beyond ancient Native capability, pointing to aliens or a lost civilization.
What the record shows: The alignments are real (the serpent's head is oriented toward the summer solstice sunset, and features have been read against solstice and equinox points) but they are well within the demonstrated skill of Indigenous North Americans. Native astronomers and builders laid out solar and lunar alignments at sites from Cahokia's woodhenge to the Newark Earthworks. Sophistication is evidence of Indigenous achievement, not evidence against it.
The claim: Archaeologists cannot even agree on the date, so the question of who built it is still wide open.
What the record shows: The live scientific debate is narrow and entirely intramural: whether Serpent Mound was built around 300 BCE by the Adena, around 1070 CE by the Fort Ancient culture, or begun by one and renewed by the other. Every option on the table is a Native American society. Genuine uncertainty about which ancestors and which century does nothing to reopen the long-settled question of whether Native ancestors built it. They did.
The claim: Stones carved with Hebrew inscriptions found near Ohio mounds prove the Lost Tribes of Israel were the true Mound Builders.
What the record shows: Those artifacts, such as the Newark Holy Stones, are 19th-century hoaxes. Their lettering mixes ancient and modern Hebrew forms in ways no genuine ancient inscription would, and scholars identified them as frauds. They were planted to prop up the Lost Tribes version of the myth, and they prove only how determined some promoters were to write Native people out of their own history.
The claim: Giant skeletons were dug out of the mounds, and their existence was covered up.
What the record shows: The giant-skeleton stories trace to sensational 19th-century newspaper items, tall tales, and misidentified or exaggerated finds, not to verified remains. No authenticated giant skeletons exist, and the recurring claim that the Smithsonian hid or destroyed them is an internet legend with no documentary basis. The remains actually recovered from mound contexts are those of ordinary human beings, the Indigenous people who built and used the sites.
The claim: Serpent Mound has always been regarded as the work of a mysterious lost people.
What the record shows: That framing is itself an artifact of the myth. Squier and Davis mapped the effigy in 1846, Putnam excavated and preserved it in the 1880s, and by 1894 Cyrus Thomas had established Native authorship on the evidence. The Ohio History Connection and archaeologists today present Serpent Mound plainly as Native American heritage. The mystery was never about the builders' identity; it was manufactured to obscure it.
Other readings
Angles that don't fit neatly into the claim or its rebuttal, laid out and weighed, not endorsed.
The legitimate-mystery misdirection
A common move treats the real Adena-versus-Fort-Ancient dating debate as if it reopened the question of who built the mound. It does not. Scholars disagreeing over which Native culture built and renewed the serpent, and in which century, is ordinary science working on thin evidence. Presenting that intramural uncertainty as license to reconsider giants or aliens is a category error that smuggles the debunked lost-race myth back in through a legitimate-sounding door.
The ancient-aliens repackaging
Modern ancient-astronaut media recycles the 19th-century denial in a new costume. Where Victorians credited a lost white race or the Lost Tribes, television now credits extraterrestrials, but the underlying claim is identical: that Native Americans could not have built what they demonstrably did build. Native writers and the Ohio History Connection have called this out directly as a slur dressed up as entertainment, one that demeans Indigenous heritage while pretending to celebrate mystery.
Timeline
- c. 300 BCE – 1100 CENative American communities in the Ohio Valley build and maintain earthen mounds and effigies across many centuries. Serpent Mound sits near classic Adena (Early Woodland) burial mounds, and later radiocarbon work ties phases of the effigy to the Fort Ancient culture as well. Both are Indigenous societies.
- 1780sThomas Jefferson excavates a burial mound near Monticello using careful, layered methods and concludes it was built by the ancestors of living Native Americans. The early informed view in North America correctly credits Indigenous peoples.
- 1810s–1840sAs settlers push into the Ohio and Mississippi valleys during the era of Indian removal, a rival narrative takes hold: a lost race of Mound Builders, exterminated by the ancestors of contemporary Indians. Politicians and popular writers embrace it, and it becomes a fixture of American self-mythology.
- 1846Ephraim Squier and Edwin Davis survey and map Serpent Mound. Their volume Ancient Monuments of the Mississippi Valley (1848) becomes the Smithsonian Institution's very first publication, documenting the earthwork in detail while the lost-race question hangs over the era's interpretation.
- 1880sFrederic Ward Putnam of Harvard's Peabody Museum studies and excavates Serpent Mound and, alarmed by plowing and erosion, leads a fundraising campaign to buy the site in 1887 and preserve it. It becomes one of the first privately funded archaeological preserves in the country; the land later passes to the state of Ohio.
- 1894Cyrus Thomas, head of the Bureau of Ethnology's Division of Mound Exploration, publishes a book-length Smithsonian report after years of fieldwork. It dismantles the lost-race theory point by point and concludes there is an unbroken chain connecting the mound builders and the historical Indians. Scholars call it a founding moment of scientific American archaeology.
- 1966Serpent Mound is designated a National Historic Landmark, formally recognizing it as a nationally significant example of ancient Native American monumental art.
- 1991Radiocarbon dating of charcoal recovered from within the effigy returns a date of roughly 1070 CE, prompting many archaeologists to attribute the serpent to the Fort Ancient culture rather than the earlier Adena.
- 2014A new radiocarbon study reinterprets the evidence to suggest an Adena-era origin around 300 BCE, with later Fort Ancient repair or rebuilding around 1100 CE. The debate over which Indigenous culture and date is genuine and unresolved; crucially, every candidate is Native American.
- 2010s–presentCable television and internet pseudoarchaeology revive the old denial in new costume, crediting Serpent Mound to Nephilim giants, the Lost Tribes, or ancient astronauts. The Ohio History Connection and Native nations push back, calling the theories demeaning to Indigenous heritage.
Contradicted. The Great Serpent Mound is a real and magnificent monument: a roughly quarter-mile earthen serpent effigy in Adams County, Ohio, built by Native American communities. What this file rates as debunked is the so-called Mound Builder myth: the 19th-century claim that the mounds and effigies of the eastern United States were too sophisticated for Native people and must have been built by a vanished superior race (variously imagined as white Europeans, the Lost Tribes of Israel, Atlanteans, biblical giants, or, in modern versions, ancient astronauts). That claim is false, and it was never neutral. It grew up alongside westward expansion and Indian removal, and it worked to deny Indigenous achievement and to justify dispossession. Archaeology settled the question well over a century ago: Cyrus Thomas's 1894 Smithsonian survey found an unbroken chain connecting the mound builders to historical Native Americans. A genuine, entirely separate scholarly debate continues over which Indigenous culture built and rebuilt Serpent Mound, the Early Woodland Adena or the later Fort Ancient people, but both are Native American, and that debate does nothing to revive the lost-race myth.
Reviewed by The Conspiratory Editors · Last reviewed July 19, 2026 · How we rate
Sources
- 1.Serpent Mound, World History Encyclopedia (2021)
- 2.Serpent Mound, Ohio History Connection
- 3.Ohio's Serpent Mound: An American Indian Story Written in the Earth, Ohio History Connection
- 4.Fort Ancient Culture: Great Serpent Mound, Smarthistory
- 5.Redating Serpent Mound, Archaeology (Archaeological Institute of America) (1996)
- 6.Serpent Mound: Location, Origins & Preservation, History.com
- 7.Report on the Mound Explorations of the Bureau of Ethnology, Cyrus Thomas / Smithsonian Institution (1894)
- 8.The Mound Builder Myth: Fake History and the Hunt for a Lost White Race, University of Oklahoma Press (Jason Colavito) (2020)
- 9.Crazy Theories Threaten Serpent Mound, Demean Native Heritage, ICT (Indian Country Today)
- 10.Serpent Mound, Wikipedia
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