Were the city builders helped by aliens?

When historians first started to write textbooks on the history of civilisations, they firmly believed that societies evolved gradually, in small increments. Nomadic tribes settled and created a small village that then slowly grew into a small town, then a city.

In short, cities evolved over a long time.

But actually, modern dating techniques have revealed a shocking truth – large cities often appeared out of almost nowhere!

Click here to learn more.