An adventure of the Far Future by Grand Master of Science Fiction Clifford D. Simak
While Earth sleeps her thousand years, the City looks starward . . .
It was a city on a high rock in a vast plain--on a planet whose glory was long forgotten. The gaunt "wardens" which roamed the prairie called it Thunder, and feared it well. But Cushing, who had read of it in the Story, who had crossed an empty continent to find it, knew it by another name: the Place of Going to the Stars.