Epics, epics…let see what’s on my shelf. I don’t really like all of these, it some of my all-time faves are in here and others are wildly popular with people I consider at least as worth heeding as me.
Fiction:
The Dune series
Patrick O’Brien’s Aubrey & Maturin series
Bernard Cornwall’s Sharpe series
Vernor Vinge’s A Fire Upon The Deep and A Deepness Across The Sky
multiple series by Peter Hamilton
Dan Abnett’s Gaunt and Inquisitor series, Warhammer 40K
The Horus Heresy, by approximately everybody, also 40K
Gregory Benford, Galactic Center series
Olaf Stapledon, Last And First Men and Star Maker - in all seriousness, I can’t think of anything on the scale of Star Maker, and yes, I’m including Tolkien‘s unpublished work in that.
Non-fiction:
Edward Gibbons, The Decline And Fall Of The Roman Empire
John McPhee, Annals Of The Former World
Peter Ackroyd’s history of England
Joseph Needham’s history of Chinese science and technology
No shortage of epics outside of fantasy, I’m thinking.