Future. Approximately 500 years. It's close enough to the
  present that I would likely *recognize* something of it and the
  language shouldn't have changed enough for me to be able to not
  understand anybody.

  But it's far enough away that advances will take the rest of my
  life to understand, assuming I don't get dissected by a
  scientist which is also likely, depending on whether science
  advances socially or stagnates with its current outlook on
  humanity.

  If I could, I'd be a historian, filling in the gaps of their
  knowledge. They will have lost a LOT OF KNOWLEDGE 500 years from
  now.

  Where will these words I'm writing be in 500 years? Heck, where
  will they be in five years? Unless I publish it somehow, gone
  forever. So will a lot of knowledge go as it always does.