Why this page exists
Popular coverage of these sites tends to resolve everything. The pillars were a temple, the animals mean this, the site was buried deliberately, Karahan Tepe is older.
The excavation literature is far more careful, and the honest gaps are where the interesting work is. A page that lists what is not known is more useful than one that pretends otherwise — and it is the only way to read new headlines sensibly.
What follows separates questions that are genuinely open from claims that are simply unsupported.
Göbekli Tepe
How much of the fill is deliberate? The classic account said the enclosures were intentionally backfilled. The current excavation attributes much of it to slope collapse and displaced midden, possibly mixed with some deliberate backfilling. This unsettles a great deal downstream — including how much the animal bone in the fill can prove about feasting.
How extensive were the domestic zones, and how did household areas relate to the monumental buildings? Domestic evidence on the mound is a relatively recent and still-developing picture.
Was there leadership? Whether social authority was hidden, situational, charismatic, or deliberately not expressed in material terms is unresolved — and it bears directly on how the labour was organised.
Was there a water system? Channels, cisterns and rainwater harvesting are discussed; the date and function are not settled.
The full imagery record. A pillar-by-pillar, enclosure-by-enclosure inventory still awaits the excavation's imagery volume. Statements about what is 'always' or 'never' depicted are premature until it exists.
Who the modified skulls were — ancestors, enemies, or something else. The cut marks and drilled perforation are secure; the meaning is not.
Karahan Tepe
Its absolute chronology. Excavation began in 2019 and much public dating rests on comparison with Göbekli Tepe rather than a published radiocarbon sequence. Whether it is older, younger or contemporary is not established.
What the pillared chamber was for. Initiation, ceremony, gathering, or a function with no modern equivalent — all proposed, none demonstrated.
What the carved head represents, and whether it relates to the treatment of actual human heads elsewhere in the region.
What the channel carried. Ritual liquid and rainwater drainage are both plausible; there is no residue evidence either way, and 'blood channel' is not supported.
Whether the phallic reading of the pillars is the intended one or a modern imposition.
How its fill formed — the same deliberate-versus-collapse question now live at Göbekli Tepe.
Sayburç
Whether the relief is genuinely narrative. The excavator reads five figures in two compositions as depicting a situation — an event or story rather than a set of animals. It is a strong claim and it rests on interpretation of arrangement.
What the object held by the crouching figure is. A snake, a sling, or something else; reported descriptions differ.
Whether the imagery can be read at all without the story it referred to. If these are characters in a myth, the myth is gone.
How representative the building is, given the site is largely a single short occupation.
What the secondary burial practices mean — skulls and long bones handled after death, with traces related to defleshing and burning in some contexts. Note one precise negative: Sayburç has no confirmed perforated or suspended skulls of the Göbekli Tepe kind.
Sefertepe
The skull counts are now clearer but still moving. 43 skulls are documented across two chambers as of the 2025 season, from infants of six months to adults of around forty. Full publication is awaited, and the total has risen every season so far.
Whether the skulls show cut marks or perforations like Göbekli Tepe's, which would link the practices directly.
Why the infant bones are there, and whether they belong to the same act.
Whether the Tigris–Euphrates architectural blend holds under fuller publication.
Its pillar record — count, dimensions, contexts and decoration are not published at the level available for Göbekli Tepe.
Çakmaktepe
What the animal-head deposits are. Offering, closure, display, deposited feasting residue, or accumulation over time — and possibly different answers for different deposits.
Where the burning happened — in place, or elsewhere before deposition. The answer changes the interpretation.
The arrangement within the deposit outside Special Building 15, and whether it has internal structure.
How early the site really is. Çakmaktepe is discussed as early-horizon material, and claims that it predates Göbekli Tepe need the published sequence before they can be assessed.
The full faunal table, with confirmed counts and species identifications.
Questions that cross the whole region
Why monumental building started, and why it stopped. The correlation with the onset of farming is close; the causation is not demonstrated in either direction.
How the labour was organised without evident hierarchy, coercion or surplus in the later sense.
Whether the sites were contemporary or sequential, and how the network functioned — one tradition, or related traditions in contact.
What the animal imagery meant. Lee Clare argues it should be read as narrative rather than wildlife observation, which implies stories we cannot recover.
Why the imagery is so overwhelmingly male, and where female symbolism is preserved or simply absent from the surviving medium.
Whether 'temple' is the right word at all. Necmi Karul prefers 'special building' — communal and distinct from houses, without the assumption of worship.
Things that are not open questions
It is worth separating genuine uncertainty from claims that are simply unsupported.
Aliens, Atlanteans and lost advanced civilisations are not live hypotheses. The toolkit is Neolithic throughout — flint and obsidian, no metal, no machinery.
The comet-impact reading of Pillar 43 is rejected by the excavation team.
A great mother-goddess cult at Göbekli Tepe has no evidential basis; the single female depiction is a late graffito.
That the sites are 'the world's first temple' is a marketing phrase resting on a contested definition of temple.
Uncertainty in the archaeology is not a licence for any claim. The open questions above are open because the evidence underdetermines them — not because anything goes.
Common questions
What is still unknown about Göbekli Tepe?
How much of the building fill is deliberate rather than slope collapse, the extent of domestic zones, whether there was leadership, the date and function of possible water systems, the full imagery inventory, and who the modified skulls were.
What is still unknown about Karahan Tepe?
Its absolute chronology, what the pillared chamber was used for, what the carved head represents, what the channel carried, and how its fill formed. Excavation only began in 2019.
What is still unknown about Sayburç?
Whether the relief is genuinely narrative, what the object held by the crouching figure is, and what its secondary burial practices mean. Notably it has no confirmed perforated skulls of the Göbekli Tepe kind.
What is still unknown about Sefertepe?
The reconciled skull count, whether the skulls show cut marks like Göbekli Tepe's, why infant bones are present, and whether the Tigris–Euphrates architectural reading holds.
What is still unknown about Çakmaktepe?
What the animal-head deposits mean, whether burning occurred in place, the internal arrangement of the deposit outside Special Building 15, and how early the site really is.
Is it true that nobody knows what these sites were for?
Broadly yes for specific purposes, but that does not make every claim equal. Aliens, lost civilisations and the comet-impact reading are not open questions — they are unsupported by the excavated evidence.
Sources & further reading7 references
- Clare, L. (2020). Göbekli Tepe, Turkey. A brief summary of research at a new World Heritage Site (2015–2019). e-Forschungsberichte des Deutschen Archäologischen Instituts 2020(2): 81–88.
- Karul, N. (2021). Buried Buildings at Pre-Pottery Neolithic Karahantepe. Türk Arkeoloji ve Etnografya Dergisi 82: 19–29.
- Özdoğan, E. (2022). The Sayburç reliefs: a narrative scene from the Neolithic. Antiquity 96(390): 1599–1605. doi:10.15184/aqy.2022.125
- Schmidt, K. (2012). Göbekli Tepe: A Stone Age Sanctuary in South-Eastern Anatolia. Berlin: ex oriente. The foundational monograph by the site's first excavator.
- Dietrich, O., Heun, M., Notroff, J., Schmidt, K. & Zarnkow, M. (2012). The role of cult and feasting in the emergence of Neolithic communities. New evidence from Göbekli Tepe, south-eastern Turkey. Antiquity 86(333): 674–695.
- Gresky, J., Haelm, J. & Clare, L. (2017). Modified human crania from Göbekli Tepe provide evidence for a new form of Neolithic skull cult. Science Advances 3(6): e1700564. doi:10.1126/sciadv.1700564
- Onsite notes from archaeologists working at Sefertepe (2024). Field observations recorded at the site, end of August 2024. Unpublished field notes held by Taş Tepeler (tastepeler.net). First-hand site notes, not a peer-reviewed publication. Figures may be superseded by the excavation's own reporting.
Full bibliography: the Taş Tepeler reference library →