Whenever I travel to new places, I take photos of informative signs that interest me.
This is one of the informative signs I captured when I visited the Acropolis of Athens last year. There are many archaeological remains throughout the site and each major structure has informative pictures to help you identify the ruins and a short description on the history of the restoration works.
I've captured a section of the informative text as a reference so that I can read it on my computer anytime.
Here's the Propylaia, the entrance to the Acropolis
Another section of Propylaia