I can only vaguely remember parts of this — a female astronaut or scientist (I think) is exploring a planet that seems to have been abandoned. What she finds is a lot of architecture that seems to have organically arisen from the planet. It doesn't seem to be built, but like it grew this way or something. None of the former inhabitants are still alive, but she is trying to figure out the mystery of this abandoned city. I think it's also possible she may have been alone on the planet but radioing up to others? Perhaps on a ship?
I would guess I read it in the last ten years or so, and that it was published in roughly the same window. There were definitely other characters! I unfortunately do not remember any of them. Additionally, I think some other non-human creatures or beings might have shown up at some point.
I wish I could remember more; it has been driving me crazy.