Models not showing from inside

I got some building assets from the asset store. When I look at them from the inside, I can see right through the walls. I can see some of the edges but that's it. This happens a lot. Is this normal, and is there a solution?

 

Hi,
If your models do not have inside facing polygons, that's perfectly normal. You have to check if the models are made so that you can view them from inside.