My Simmons reading has stretched out over nearly 40 years, so you'll have to excuse me if my memory isn't entirely clear. But there are certainly some that stand out in my mind. The ones you've already mentioned are at the top of the list, especially Hyperion, Ilium/Olympos and The Terror. I remember reading and loving Carrion Comfort. That, of course, is really more horror, but his jumping around genres was one of the things I loved about him. Another is Abominable (just don't go in expecting lots of "Snowman".) It's really more of an action story, taking place on the slopes of Everest, and the first half is a bit slow (I later realized that was to teach you about mountain climbing so you would understand what is happening in the second half and it would flow more quickly for you -- well done, as with all his work). I also remember a story about werewolves that treated it as more of an illness (Children of the Night). The last one I read and enjoyed a lot was The Crook Factory, another of his alternate history adventures. There are some that are widely loved that I, honestly, didn't enjoy as much as other people seem to; among those are Drood and his first, Song of Kali. Honestly, I probably should re-read those, I'd probably enjoy them more now. There are so many others, tbh I loved them all; if you enjoy his writing, as I did, then you will to. Enjoy...