I know this is kind of a "little kid" question but what would be on the other side of the wall?
Most likely nothing. Empty space.
I love talking about stuff like this. It is so interesting. Here are some weird facts that I learned (most of them from the science channel):
If the string theory is correct (that every atom is made up of a ton of extremely small strings that are basically codes that tells it what it does), then if an atom were expanded to the size of the known universe, one of these strings would be about the size of a medium sized tree.
The nucleus of an atom is about 10,000 times smaller than the entire atom. An atom is mostly empty space.
2
600 (2 multiplied by itself 600 times) is greater than the number of atoms in the known universe.
The closer you get to the speed of light, the faster you travel through time.
If you could travel faster than the speed of light, you would go back in time.
There are no laws of physics that say that it is impossible to go back in time, which means that it is possible (somehow).
There are probably some more facts that I know, but I can't think of them right now.