Well, this Universe has at least one boarder, me!
But seriously, we (humans) don't seem to know what lay beyond that point which was the origin, nor what lays beyond the boundaries of the big bang. Mathematical theories of what is seem to suggest what might be, but as far as I've read, not far, not what is.
This Universe is expanding. Into what? And what does that "space" contain? And what is the size of the grander scheme, and what is that "in".
(I know, I know. Turtles all the way down.)
It looks to me like standing in a big balloon, and trying to figure out where the balloon came from and what's outside it. Beats the hell out of me, obviously, and people who have studied it a lot harder than I.