Strange History

The Stelae of Aksum: How Were 500-Ton Stones Raised?

By The Unsolved Report Editorial Team · Last reviewed 2026-06-19

Ethiopia's Aksum stelae include a 33-meter, ~520-ton monolith—the largest single stone humans ever tried to raise. Here are the facts and the open mystery.

On a windswept field at the northern edge of an ancient Ethiopian city, a single block of stone lies shattered across the ground. Had it stood upright, it would have risen roughly 33 meters—about as tall as a ten-story building—and it weighs an estimated 520 tons. Archaeologists believe it is "likely the largest single monolith which people have ever attempted to erect" (Simon Fraser University, Museum of Archaeology & Ethnology). It never quite made it upright. How the Aksumites quarried, moved, and raised stones on this scale—and why their most ambitious one fell—remains one of Africa's great engineering puzzles.

The Documented Facts

Aksum (also spelled Axum) was a wealthy trading kingdom in what is now northern Ethiopia and Eritrea. It rose around the 1st century CE and at its height linked Roman, Mediterranean, and Indian Ocean trade routes, minting its own coinage and controlling Red Sea commerce (Britannica). Under King Ezana in the 4th century CE, Aksum became one of the first states in the world to adopt Christianity, converted with the help of Frumentius, who became its first bishop (Britannica).

The stelae—tall, carved monoliths erected mainly between the 3rd and 4th centuries CE—mark this peak. They functioned as funerary monuments standing above elite and royal underground tombs (The Metropolitan Museum of Art). They were carved from single blocks of nepheline syenite, a hard, weather-resistant stone similar in appearance to granite, quarried from hills roughly 4 kilometers west of the city, including Gobedra (Simon Fraser University).

What sets the largest stelae apart is their decoration. The finest are carved in low relief to imitate multi-storey buildings, complete with false doors at the base and rows of windows running up each face. The Great Stele represents a thirteen-storey building; the second-largest, nine storeys (Met Museum). Three giants dominate the site:

The Great Stele (Stele 1): roughly 33 meters and about 520 tons. It lies broken in several pieces and probably fell during or shortly after the attempt to raise it (Simon Fraser University).
The Obelisk of Axum (Stele 2, the "Rome Stele"): about 24 meters and roughly 160 tons. Italian forces cut it into three pieces and removed it during the 1937 occupation; it stood in Rome for decades, was returned to Ethiopia in 2005, and was re-erected at Aksum in 2008 (Wikipedia: Obelisk of Axum).
King Ezana's Stele (Stele 3): about 21 meters, carved from a single piece of stone, and the largest of the giant stelae still standing intact (Simon Fraser University).

In 1980 UNESCO inscribed Aksum as a World Heritage Site, citing the stelae among the ruins that mark the heart of ancient Ethiopia.

The Genuine Open Question

Here is the honest gap in the record: no Aksumite text survives explaining how these monoliths were quarried, transported, or raised. As one scholarly summary puts it plainly, "No one knows exactly when or how they were quarried and erected" (EBSCO Research Starters).

The numbers make the puzzle vivid. A 520-ton block had to be detached cleanly from bedrock without modern explosives or steel tools, then moved several kilometers over uneven terrain, then tilted from horizontal to vertical and seated precisely over a tomb. For comparison, the Great Stele is far heavier than the largest standing stones at Stonehenge and dwarfs the moai of Easter Island in both height and mass. Even the techniques we can reasonably infer leave open questions about the labor, the rigging, and the foundations required.

The Great Stele's failure deepens the mystery rather than solving it. When it came down, it struck Nefas Mawcha, a nearby megalithic tomb structure. According to UNESCO's documentation cited in coverage of the site, the falling stele shattered and its impact collapsed the central chamber of that tomb, which was sheltered by a single roofing slab weighing on the order of 360 tons (Silk Road Coffee Co. summary of UNESCO findings). The collapse is widely thought to have ended Aksum's tradition of erecting giant stelae. But whether the Great Stele toppled during the raising itself, or stood briefly before the ground beneath it gave way, is not settled.

Theories and Interpretations (Labeled as Such)

The following are scholarly reconstructions and informed speculation, not eyewitness accounts.

The ramp-and-lever hypothesis (mainstream). Most archaeologists reason that the Aksumites used a familiar toolkit of pre-industrial megalithic engineering: large organized labor gangs, wooden sledges and rollers to drag the stones from the quarry, and earthen ramps combined with levers to lever each stele upright and slide it into a prepared socket (EBSCO Research Starters). This is consistent with how comparable monoliths were moved elsewhere in the ancient world, though it remains a reconstruction rather than a documented method.

The elephant tradition (folklore, unverified). A popular local and tourist-literature claim holds that Aksum's famed war elephants helped haul the stones. It is plausible that draft animals assisted, but the specific elephant story is not supported by archaeological evidence and should be treated as legend.

The foundation-failure explanation for the collapse (a leading interpretation). Many researchers suspect the Great Stele was simply too massive for the ground and tomb chambers beneath it to bear—an ambition that outran the engineering. The fact that it struck and crushed the Nefas Mawcha chamber is read by some as a sign that the substructure could not support the load. This is a reasonable inference from the physical evidence, but the exact sequence of failure is unproven.

What is not in dispute is the achievement itself. Whoever raised the 24-meter Obelisk of Axum and the 21-meter Ezana stele—both of which stand today—mastered a problem of weight and balance that would challenge modern crews. (Re-erecting the returned Obelisk in 2008 required heavy modern machinery, a quiet measure of the original builders' skill.) The shattered Great Stele is not a story of failure so much as a record of how far an African civilization was willing to reach. The mystery of exactly how they reached it is, for now, still open—and that is what keeps the field worth standing in.

Sources & Further Reading

Sources & further reading

https://www.britannica.com/place/Aksum-ancient-kingdom-Africa
https://www.metmuseum.org/essays/the-monumental-stelae-of-aksum-3rd-4th-century
https://www.sfu.ca/archaeology/museum/exhibits/virtual-exhibits/aksum/aksumite-stelae.html
https://en.wikipedia.org/wiki/Obelisk_of_Axum
https://www.ebsco.com/research-starters/anthropology/giant-stelae-are-raised-aksum
https://whc.unesco.org/en/list/15/