Remembrance of Earth's Past Trilogy

Although each part can be read independently, the whole trilogy has a consistent story line which happens in a very huge time-space context and the first just a beginning. The later two are especially much more hardcore and dramatical, however, gloomy as well. While the first one got the Hugo Award, I'd like to say that it really worth a try for the whole trilogy, don't miss the later two. - @cp4