I picked up Jesus in Jerusalem, which showed maps and compared them with scripture to show how the city looked back in the day and what the various areas of Jerusalem would be used for. Instantaneously, I started looking at the maps wondering how I could flesh it out for an adventure, even going so far as to start imagining flavor events that would give visitors to the city a real feel for the culture. I started pondering how PCs would handle the strong church and the hustle crowd that passover would bring. Then I started wondering how I would translate this into a 3.5 diety and the main city of his temple.
Yeah... I am a geek.
but I borrowed the book.