Megaliths

 I have been watching  YouTube videos and documentaries, some of which were about archeology.

Stone circles seem to be ubiquitous. There are 5000 year old stone circles in the islands off Scotland, in UK, in the middle East, in India, maybe in the Americas- all dating from maybe 10000 to 3000 years ago. How did that architectural concept become so widespread? How did this idea get communicated all through the world? It's not a natural or easy job to lift stones weighing tons and make them stand upright. Or above standing stones in a dolmen. And how did they transport and position these huge megaliths?

And they built the huge temple at Gobekli tepe 12000 years ago.