The Persian Wars
by Herodotus
I've started reading more of the ancient classical authors (Tacitus, the Church Fathers, Aristotle, etc.), and this is one of the ones I'm reading now. Ancient histories like these are interesting to read. I prefer the style in which they're written over many more recent (19th-20th century) histories, which are often very dry or too filled with dates to allow a person to absorb the information easily, especially when one has limited background information on that period of history. Anyway, it's a pretty good read. I'm still on book one (of four, I think), and have been for some time, but that's because I read way too many books at once. It's become more difficult now that I have less free time than before and it gets harder and harder to keep track of all the different story lines as time goes on. :P