I'm not sure if time travel either to the past or future is possible.  The only thing we know for sure is the present right?  I believe we live in a parallel world where it's possible that we are living in the past, present and future.  We hear people who claim to see apparitions, spirits or entitys - whatever you want to call them, but could those sightings be a crossing over from another world through space and time? It's kinda like tuning into a radio station, you hear those high frequency sounds until you finally tune in and hear the station clearly.....  .. like tuning into the parallel world you see the entity from the past or the future and then it fades out and is gone...   Just a crazy thought .....