What are the towers John sees?
The towers he sees could be any of a number of things. He was approaching a large city, presumably New York or Washington, DC. The towers could have been the supports of a bridge span. Also, many of the high rises still stood. These could be the towers he refers to. He referred to them as looking blind, so I would imagine they were high rises with glass windows. No one was looking from them, so the windows looked like blind eyes. In this place, he discovers the body of a man and has a revelation. This was not a Place of the Gods, but a Place of Men.