However, no known human civilization has ever endured for so long.

With luck, it might carry you safely beyond the limits of known civilization.

The Romans were one of the first known civilizations to invent indoor plumbing.

I can say confidently one thing; they are no known civilization or technology.

From the earliest times in known civilizations, events in the natural world were expressed through a collection of stories concerning everyday life.

Propaganda has been used in every known civilisation.

The world's first known civilization developed in Mesopotamia, now Iraq.

The civilization was spread over some 1,260,000 km2, making it the largest known ancient civilization.

They were the only known civilization of pre-Columbian America to have a fully developed written language.

In over two hundred thousand years, no known civilization had come close to re-creating the transportation system of the Iconians.