There is no such point (or it is everywhere if you like, as someone else had said). The best analogy I've seen is that of ants on a balloon. They live in what

There is no such point (or it is everywhere if you like, as someone else had said). The best analogy I've seen is that of ants on a balloon. They live in what appears to them to be a two dimensional universe. As you inflate the balloon, they observe their own universe getting bigger. But the "point where the Big Bang happened" to them is not a point that even exists in their universe any more. They cannot get back there, since the higher third dimension does not exist in their universe.