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Godel, in 1949, proposed a solution to general relativity where, the universe, is rotating. That being said, if one could travel in a rocket ship around this hypothetical Godel universe, you would return to your starting point and shift back in time. In this scenario, you could, in principle:
Travel between any two points in spacetime in the universe.
Any event, from any period of the universe's history could be visited, despite how far in the past.
However, it is possible that a Godel universe could collapse on itself due to it's own gravity. The idea is that the centrifugal force from the Godel universe's rotation would balance out this force of gravitation. The Godel universe must be rotating at a certain velocity. Larger universes would have a greater tendency to collapse, hence, would have to rotate faster.
Einstein will also point out: the universe does not rotate, it expands.
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