You follow the left passageway. It leads upward to the surface. Before you, a grassy meadow slopes down to a clear, fast-flowing stream; beyond it are pine-covered foothills stretching in the distance toward snow-covered peaks. You might be in Wyoming in your own time, but, whatever time it is, the world you see appears to be a hospitable one.

You notice a herd of buffalo grazing. But nowhere can you see a house, or fence, or road, or any sign of human presence. It is possible you are living hundreds, perhaps thousands, of years ago. You gaze upward. One of the puffy, white cumulus clouds is moving in a strange fashion. It is descending! A spaceship is landing right before your eyes, only a few hundred yards away!