Century Rain Alastair Reynolds 2005
Three hundred years in the future, Verity Auger is a specialist in the archaeological exploration of Earth, rendered uninhabitable after the technological catastrophe known as the Nanocaust.
After a field-trip to goes badly wrong, Verity is forced to redeem herself by participating in a dangerous mission, for which her expertise in invaluable.
Using a backdoor into an unstable alien transit system, Auger's faction has discovered something astonishing at the far end of a wormhole: mid twentieth-century Earth, preserved like a fly in amber. Is it a window into the past, a simulation, or something else entirely?
Century Rain is not just a time-travel story, nor a tale of alternate history. Part hard SF thriller, part interstellar adventure, part noir romance, Century Rain is something altogether stranger.