Martin Padway, 20th-century archaeologist, becomes a reluctant one-way time-traveller, landing in Rome on the verge of the Dark Ages. With no way home, he sets out to make the world he's in a better place. In short order, Padway "invents" and...
'Down in the Bottomlands' is a novella written by Harry Turtledove which takes places in an alternative history in which the Atlantic Ocean did not reflood the Mediterranean Sea 5.5 million years ago in the Miocene Epoch, as it did in our...