The Baroque Cycle was a
lot of heavy chewing, but it was ultimately a pretty good story, and I was sad to come to the end of it. It's also, along with
Cryptonomicon, one of the more interesting explorations of the world of money and finance I've found.
You might also enjoy REAMDE which it a bit faster-paced. I happened to enjoy Anathem as well, though that was also a bit of a slog. It did have a resolution though. And protractor.