We all enjoy these books. My daughter is not yet two but she loves Ann Morris' entire series of books and likes to identify things in each photograph. The photos are obviously dated but I don't believe that lessens the impact of what the author and photographer are trying to do.
As she grows, we'll continue to read these books, moving on from identifying simple items to talking about cultures, traditions, environments, geography, socio-economics, and etc. In the final pages of each Ann Morris book there are maps and descriptions of locations/subjectss for each page that allow readers to discuss where places are in relation to one another and what is really happening in photos versus what a young child (or adult!) might imagine is happening.
I recommend these books for curious children starting at age 18 months and all the way up into the school years.