They may have watched other civilizations come and go.

When women fight, civilization goes right out the window.

They must have marveled and wondered where these advanced civilizations had gone.

"Yes, this civilization is never going to do that," she agreed, and ran a fingernail down its side.

It's not the sort of thing that can be done every time some civilization goes down the toilet.

They must be stopped at Varnal-or your entire civilization could go under!

The alien civilization that created them was long gone, but their work lived on.

Even so great a civilization as once existed on this alternate world went down to nothing.

He was very good on the idea that civilization might suddenly go to rot.

Kukherd civilization goes back to ancient more than 2000 years old.