The Central Building

Structure AD is the largest building yet found at Karahan Tepe — a great hall that originally measured about 28 metres across and was rebuilt three times — its interior finally reduced to roughly 18 metres — partly cut into the living bedrock and ringed with two-step stone benches and upright pillars. If the Pillar Room next door is the site's most mysterious space, Structure AD is its communal heart: a hall built to bring a large group of people together.

It is also one of the largest structures known from the entire Pre-Pottery Neolithic — which is remarkable for a community that had not yet taken up farming.

What is Structure AD?

Like the rest of Karahan Tepe's core, Structure AD was made by carving down into the bedrock rather than building up from the ground. The result is a wide, partly sunken hall. Running around its interior are two-step (tiered) benches — low stone seats cut in two levels — while pillars stand against the walls and a pair of larger central pillars anchor the middle of the space. In the floor are deep pits, and excavators have found broken objects deliberately placed within the building.

In its final form the hall held about 17 pillars set at intervals around the wall — roughly twenty in all across its history — with two tall central pillars, about 5.5 m high, standing face to face in the middle, their tops worked into blunt, head-like projections. The two-step benches were divided by uprights into about fifteen niche-like bays — a tiered, inward-facing seating plan of the same kind reported in 2025 as the site’s “amphitheatre” (the two may well be one and the same). In scale and plan it closely parallels Structure D at Göbekli Tepe.^[3]

A hall built for gathering

The tiered benches are the telling detail. Seats arranged around a central focus are, almost by definition, architecture for assembly — for a group to sit together and attend to something happening in the middle, where the paired central pillars stand. Some reporting suggests the benches could seat on the order of a couple of hundred people. We'd put it carefully: Structure AD was clearly built to hold a substantial community at once. Exactly what they gathered for — ceremony, feasting, decision-making, or all of these — is not something the evidence yet settles, and we won't pretend it does.

What stood inside

The interior was not bare. In a niche in the southern part of the hall sat a carved human head — with two paws gripping it from above, showing it had been broken from a larger human-and-leopard composite sculpture. A low podium was built up, its bottom step a pillar laid on its side and carved with an animal head and a leopard-skin pattern. Nearby, fixed to a bench, stood a statue of a person with an animal on their back, set among stone vessels. When the building was closed, many of these sculptures were deliberately broken and buried inside it.^[3]

Connected to the Pillar Room

Structure AD does not stand alone. It is joined to the neighbouring Pillar Room (Structure AB) — the sunken chamber of eleven pillars and the carved head — as part of a single connected core. Reading the two together, you get a sense of a designed complex: a large communal hall beside a smaller, more intense, more hidden chamber. Movement between the two seems to have mattered.

How it ended: a deliberate closing

Like other buildings at Karahan Tepe, Structure AD was not simply abandoned. At the end of its life it was deliberately filled in and closed, with broken objects placed inside as part of the process. Whether we read that as a respectful "retirement" of the building or as something more ritually charged, the intent is clear: the hall was purposefully brought to an end, not left to decay.

The floor itself was cut into the bedrock across a natural fault line, which the builders repaired and paved over. Set into it are pits — one about 2 m wide and 1.9 m deep — that physically link Structure AD to the Pillar Room (AB) and to the neighbouring Structure BF; a few human bones found in one of them suggest they also served for burial.^[3]

What was Structure AD for?

We follow the evidence and the excavators here, and we're careful with the label. Structure AD is best described as a large central communal building — the site's principal gathering space. It is tempting to call it a "theater," a "temple," or a "council house," but those words import functions we can't yet demonstrate. What we can say is well supported: it was big, it was built for people to come together, its pillars gave the space a charged focal point, and it was ceremonially closed. The rest is still being excavated.

Frequently asked questions

What is Structure AD at Karahan Tepe?

It is the largest building yet found at the site — a central communal hall that originally spanned about 28 metres (its interior later reduced to roughly 18), partly cut into the bedrock, with two-step benches, wall and central pillars, and floor pits. It was deliberately filled in at the end of its use.

How big is Structure AD?

Originally about 28 metres across, rebuilt three times with its interior finally reduced to roughly 18 metres — still one of the largest known Pre-Pottery Neolithic buildings.

What was Structure AD used for?

Its tiered benches point to communal gathering — a place for many people to come together. The precise purpose (ceremony, feasting, assembly) is still debated, and we avoid over-claiming a single function.

Why was Structure AD filled in?

It was deliberately closed at the end of its life, with broken objects placed inside — a purposeful "closing" of the building rather than simple abandonment. The exact meaning is still discussed.

Nearby structures: The Pillar Room (AB) · The Carved Heads · Human Figures. Or return to the interactive overview.