28 maybe 29.

A good list, who would we add if we forgot about the last 50 years and just went back as far as we could?

As a start, how about, in no special order:

The Time Machine, HG Wells
The First Men in the Moon, Jules Verne
The Worm Ouroboros, ER Eddison
The Well at the World's End, William Morris
The Mabinogion, ?