Misner space is an abstract mathematical spacetime, discovered by Charles Misner of the University of Maryland. It is also known as the Lorentzian orbifold
An intuitive analogy may be drawn with a video game screen, where a screen element exits the frame through the right side, only to re-enter the frame right away through the left side.
Moving the spatial limits (e.g.: the walls of a room) enclosing an existing Misner space in the physical world, could theoretically lead to time travel.
References
Misner space Wikipedia(Text) CC BY-SA