cosmology - Is space unending?

Is the space unending, i.e it has no boundaries? If yes, how can a thing exist which is non-ending? Its impossible for me to imagine something like that. Secondly, if its not and has boundaries then it must be inside some other thing which is either non-ending or itself contained in another thing. Yet, again same problem. If it is also inside some other thing, and the other thing is also inside other thing, then this series will never end. Imagining about this scenario makes me insane.