I don't know if hegel's the philosophy of history is considered philosophy, but it's the book i lately finished. It's a bit hard for me, and i didn't understand it very well. There is the famous sophie's world for people who don't know very much about philosophy, like me. It's a great history of philosophy ,at least for me. even teens can understand it. besides i highly recommend you the ancient chinese's philosophy works. Try confucious, mencious, laocious and chuangcious. Believe me, you won't be dissappointed.
Wow, i see many people recommending sophie's world, i'm glad that many people like it.