Like Federica, I don't know the theory of special relativity. However, searching on the Internet, I read that when the speed grows up to infinity, the mass does the same, so if we travelled at the speed of light, our body would become as a meatball! For that reason, I think that it will be impossible for us to travel at that speed or even faster in the future because this means that we'll change fundamental physics rules. Despite that, I'm sure that the technological progress will continue to develop until also common people will be able to travel through space. Space travel and planets "sightseeing" will quite probably become a new type of holiday in the future, a valid and exciting alternative to the sea or the mountain.