Hell yeah! I just went back in time a few days a go to catch up with Dean Martin and Elvis Presley, mind you it cost me a fortune in A grade lysergic acid diethylamide.
Buy seriously, I don't think travelling back in time is possible, moving forward in time maybe and crossing over into an alternative reality or alternative plane of existence, I think is theoretically possible. Though probably not in our lifetime.
Very interesting question though!
A great reference movie though would be 'Contact' with that lesbian actress from Silence of The Lambs.