In fact its not possible to travel even at a speed equal to the light of speed.
If we were able to go at a speed higher than light,we will be able to go back to our childhood and will be able to see our grand grand grand parents&able to go to our ancient days.
You see, if an object travels at the speed of light, its mass will increase exponentially!
(If we travel at a speed 10% of speed of light oru mass will increase by .5% & if we travel at 90% of dpeed of light our mass will get doubled)
Consider this, the speed of light is 300,000 kilometers per second (186,000 miles per second) and when an object moves at this speed, its mass will become infinite.