Do these mysterious stones mark the site of the Garden of Eden?

Schmidt stayed. And what he has uncovered is astonishing. Archaeologists worldwide are in rare agreement on the site's importance. 'Gobekli Tepe changes everything,' says Ian Hodder, at Stanford University.

David Lewis-Williams, professor of archaeology at Witwatersrand University in Johannesburg, says: 'Gobekli Tepe is the most important archaeological site in the world.'

Some go even further and say the site and its implications are incredible. As Reading University professor Steve Mithen says: 'Gobekli Tepe is too extraordinary for my mind to understand.'

So what is it that has energised and astounded the sober world of academia? …

…But several unique factors lift Gobekli Tepe into the archaeological stratosphere – and the realms of the fantastical.

The first is its staggering age. Carbon-dating shows that the complex is at least 12,000 years old, maybe even 13,000 years old.

That means it was built around 10,000BC. By comparison, Stonehenge was built in 3,000 BC and the pyramids of Giza in 2,500 BC.

Gobekli is thus the oldest such site in the world, by a mind-numbing margin. It is so old that it predates settled human life. It is pre-pottery, pre-writing, pre-everything. Gobekli hails from a part of human history that is unimaginably distant, right back in our hunter-gatherer past. …

…Over glasses of black tea, served in tents right next to the megaliths, Klaus Schmidt told me that, in his opinion, this very spot was once the site of the biblical Garden of Eden. More specifically, as he put it: 'Gobekli Tepe is a temple in Eden.'

To understand how a respected academic like Schmidt can make such a dizzying claim, you need to know that many scholars view the Eden story as folk-memory, or allegory.

Seen in this way, the Eden story, in Genesis, tells us of humanity's innocent and leisured hunter-gatherer past, when we could pluck fruit from the trees, scoop fish from the rivers and spend the rest of our days in pleasure.

But then we 'fell' into the harsher life of farming, with its ceaseless toil and daily grind. And we know primitive farming was harsh, compared to the relative indolence of hunting, because of the archaeological evidence.

When people make the transition from hunter-gathering to settled agriculture, their skeletons change – they temporarily grow smaller and less healthy as the human body adapts to a diet poorer in protein and a more wearisome lifestyle. Likewise, newly domesticated animals get scrawnier.

This begs the question, why adopt farming at all? Many theories have been suggested – from tribal competition, to population pressures, to the extinction of wild animal species. But Schmidt believes that the temple of Gobekli reveals another possible cause.

'To build such a place as this, the hunters must have joined together in numbers. After they finished building, they probably congregated for worship. But then they found that they couldn't feed so many people with regular hunting and gathering.

'So I think they began cultivating the wild grasses on the hills. Religion motivated people to take up farming.'

The reason such theories have special weight is that the move to farming first happened in this same region. These rolling Anatolian plains were the cradle of agriculture. …

…Of course, these theories might be dismissed as speculations. Yet there is plenty of historical evidence to show that the writers of the Bible, when talking of Eden, were, indeed, describing this corner of Kurdish Turkey.

In the Book of Genesis, it is indicated that Eden is west of Assyria. Sure enough, this is where Gobekli is sited.

Likewise, biblical Eden is by four rivers, including the Tigris and Euphrates. And Gobekli lies between both of these.

In ancient Assyrian texts, there is mention of a 'Beth Eden' – a house of Eden. This minor kingdom was 50 miles from Gobekli Tepe.

Another book in the Old Testament talks of 'the children of Eden which were in Thelasar', a town in northern Syria, near Gobekli.

The very word 'Eden' comes from the Sumerian for 'plain'; Gobekli lies on the plains of Harran.

Thus, when you put it all together, the evidence is persuasive. Gobekli Tepe is, indeed, a 'temple in Eden', built by our leisured and fortunate ancestors – people who had time to cultivate art, architecture and complex ritual, before the traumas of agriculture ruined their lifestyle, and devastated their paradise.  …

… To Schmidt and others, these new findings suggest a novel theory of civilization. Scholars have long believed that only after people learned to farm and live in settled communities did they have the time, organization and resources to construct temples and support complicated social structures. But Schmidt argues it was the other way around: the extensive, coordinated effort to build the monoliths literally laid the groundwork for the development of complex societies. …