Well, I'm profoundly interested in Church History. A friend of mine told me I should read The Mystery of Christian Power, by the English author Vladimir Moss. The book is too long, and I do not have much time, but a fast read on some chapters got me fascinated. I'm sure I'll still get it.
Today, I stumbled upon and started to read A Pocket Church History for Orthodox Christians, by Father Aidan Keller. It's a really short book, I fell like I'll end it tomorrow. A total must read for those interested on the subject.