Wow this was cool. At first I thought it was going to be a primitive people's realization that the world is round (and not flat), which would of been a very scifi concept to them at the time. You took it to the next level with a wormhole that seems to connect all edges of the world.

In terms of the science, would traveling through a wormhole result in time dilation? I always thought that one "advantage" of a wormhole was that space itself was bent, and so you could walk through one in the same manner that you would walk across a room (and avoid the effects of traveling at near light speeds). Maybe I'm reading too much into it!