The site of Gobekli Tepe is simple enough to describe. The oblong stones, unearthed by the shepherd, turned out to be the flat tops of awesome, T-shaped megaliths. Imagine carved and slender versions of the stones of Avebury or Stonehenge.
Most of these standing stones are inscribed with bizarre and delicate images - mainly of boars and ducks, of hunting and game. Sinuous serpents are another common motif. Some of the megaliths show crayfish or lions.
The stones seem to represent human forms - some have stylised 'arms', which angle down the sides. Functionally, the site appears to be a temple, or ritual site, like the stone circles of Western Europe.
To date, 45 of these stones have been dug out - they are arranged in circles from five to ten yards across - but there are indications that much more is to come. Geomagnetic surveys imply that there are hundreds more standing stones, just waiting to be excavated.
So far, so remarkable. If Gobekli Tepe was simply this, it would already be a dazzling site - a Turkish Stonehenge. 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.