On Venus they find a Utopian civilization, and the narrator falls in love.

Where she found a primitive civilization not more than a thousand years old?

I found a matured civilization, immensely inferior, however, to that from which I came.

Moments after entering it, Blade knew that his hopes of finding an advanced civilization had been realized.

But it would be a lot better if they could find a large and powerful civilization, one with plenty of military resources, like the Graks.

They found at the site a lost civilization occupying an area greater than that of Pakistan.

We'll find a civilization that doesn't need to pick at things with patty-paws, evolved beyond it.

How long does it take to found a civilization?

He found a civilization whose chief political credo was economy and went on to observe future ages.

Then have the ship find a new alien space-going civilization, and leave the decisions in the hands of the captain.