I enjoyed this twice. I'm pretty sure the first time was more of a scan. The images are great, and the overlays are fascinating to flip back-and-forth, and they remind me of how much I liked encyclopedias as a child.
This time I read every word. The text is not deep, but it does a pretty good job of hitting both current understanding of each site and a few of the uncertainties. I like that they pick an interesting array of sites, including the obvious Egypt, Greece, and Rome, but also Ankor Was, Zimbabwe, the Indus valley.
Mainly, though, this is a tribute to the pleasure we all get from looking at ruins and imagining what they might have looked like when they were used. A pleasure that I've never seen celebrated so well.