Classicly

Beyond the Vanishing Point is a science fiction short story written by Raymond King Cummings. 

When George Randolph first caught sight of Orena, he was astounded by its gleaming perfection. Here were hills and valleys, lakes and streams, glowing with the light of the most precious of metals. And, more astonishing than that, it was a world of miniature perfection—an infinitely tiny universe within a golden atom!