Another way to go from one point to another point in space time is travelling through Wormholes. Wormhole is some kind of distortion in space time that connects two point of space time. It folds space time in some strange way, may be through higher dimension. So if you jump into the wormhole you will get yourself in another point of space and time at once. Einstein unified space and time in special theory of relativity. So wormhole may distort time dimension and connect two points of future and past besides space. So Physicists hope that one day mankind will be able to travel in time thorough wormhole. We three friends once made jokes that wherever we will be if there is any problem in our beloved (present) hostel we at once make an wormhole and jump into it to get hostel.
It is impossible to create a wormhole with our present technologies. Also it is still unknown if wormhole exists in outer space or not. There is something called Einstein Rosen bridge inside a black hole which can act as gateway to other galaxies or universe ( if it exists). Physiscists propose many world concept to solve many problems, but it is not sure whether they exists or not. In Schwarzchild solution of Einstein‘s equation there is a event horizon around a black hole whose radius is equal to schwarzchild radius. Event horizon is the point of no return and anything fall into it is crushed apart( spaghettification). But in Kerr solution of rottng blackhole the rotating blakhole forms a ring around it and the curvature of space time is not infinite around that ring. So one falling through that ring may not be torn apart and one can pass through it to get the wormhole. But return trip is not allowed through Kerr ring and it is suggested that the very presence of a person would destabilise the black hole and the wormhole would be closed. Time travel is a wonderful mystery of physics. If one can travel through time and change the past or meet ones beloved what it would feel like?