If i got in a spaceship and just kept going up as fast and as far as i could - where do i come out??

If you went as fast as you coiuld, possibly the speed of light, then you will be going so fast that you will be in the future. The International Space STation is going at such a tremondous speed that the clock on the ISS is off by a few milliseconds from that of earth because of it traveling so fast that it essentailly is sent in to the future