What if the universe is 120 times larger? Maybe our part of the observable universe just looks like it happened from a Big Bang.
For all we know our universe is just the latest in a string of "detonations" due to a locus of instability in the omniverse, Think of it like ripples in water caused by a drop falling into it. Each drop (the "bang") creates a universe and the resulting "wave" pushes the preceding bangs outward, causing expansion. Simultaneously all other bangs are hidden by the peaks of the wave since they all reside in the troughs.
The waves in this case would represent a multi-dimensional "buckling" as result of the explosions, creating what amounts to an infinite potential well between each one. From down in the "troughs", you can't see anything beyond your bounded but infinite space. And that space would appear to be expanding due to the unseen force of new bangs pushing yours outwards.
Now if there's some sort of aether/friction/resistance/etc. in this omniverse then it may be possible, after a long enough period of time, for the amplitude of the waves to diminish allowing observation, or even "crashing" into previous bangs.
Basically you can come up with just about any crazy idea you want once you start pushing the boundaries of the observable universe. However, coming up with something that can be validated scientifically is another matter.