What are some good books on the history of the Catholic church?

I am currently reading "The New Concise History of the Crusades" by Thomas F. Madden. I believe he is Catholic, but he does a good job showing the good, the bad and the ugly. He doesn't make the crusaders look like saints, anything but. It's almost like he lays down the facts, and lets you choice what to think. I am learning a lot from it.