What would be your impression of the Aztec empire if you could go back in time and walk through one of their cities?

I'm not exactly sure that I know what you mean by impression. But, I assume you mean, what thoughts would cross your mind if you were able to go back in time and experience the area. You would probably think that they are very similar to the Mayan empire but are also very distinct. You would soon realize that they were very creative people.