You know how all the stars we see in the sky are really an image of the past? What if someone was watching us, say, 60 light years away... they could see World War 2 unfolding right before their eyes. Or thousands of light years away to see the Egyptian pyramids being built. Or hundreds of millions of light years away to see the dinosaurs walk the earth. Or billions of light years away... "Ah. No intelligent life there. Next!"
I dunno if worm holes actually exist, but if they do, and we could use them, could we go back and view anything in history? Or go far enough to catch up with the first piece of light, and view the big bang? Or travel away from earth at the speed of light (if it was possible) so the earth will appear stuck in time?