Time Travel
http://www.physics.uconn.edu/~mallett/main/book.htm
Ronald J Mallet could make time travel a reality before the end of this century. Let's hope no one becomes a Freejack. LOL.
The only way time travel would work is if we found a natural phenomena out in the cosmos that we could enable time travel with, well that works for travelling to the past anyways.
You can only travel as far back into the past as the moment the machine was turned on.
Time travel to the future would be possible easy, as long as the machine was kept on up to the point that you actually travel.
I think the closest we will get to time travel is manipulating gravity and light to see along the curve of time and look into the past, but that's about it.