I think it would be really cool if we had a time slider on a product like Google Earth, where we could go back in time and see how cities and roads changed and what we think they might have looked like based on all the archeological knowledge we possess.

For example, the city in this article is currently submerged under water. What was the world like right before? How about right after?

Think of it like a visual reconstruction of all of human history. It would be fascinating.