If the world were to end tomorrow and we could choose to save only one thing as the explanation and memorial to who we were, then we couldn't do better than the Natural History Museum, although it wouldn't contain a single human. The systematic Linnean order, the vast inquisitiveness and range of collated knowledge and beauty would tell all that is the best of us.
Science fiction is never about the future, in the same way history is rarely about the past: they're both parable formats for examining or commenting on the present.
Once upon a time, a historian told me that the most important choice a new historian could make was of his or her specialist subject. Most of the good stuff was far too overcrowded, so you had to pick about in the exotic and extinct. His recommendations were the Picts or the Minoans, because hardly anything was known about them and you could spend a happy lifetime of speculation.