I need some help i have made a building for my game but i can see right to it 
why 
check the shader you are using and make sure you are using one appropriate for the mesh and textures.
Looks like your normals are not correct. You should recalculate them in your 3d app.
Whare to chance it ?
Is thare any movie for ?
What 3d program are you using?
its not that your normals are not correct, they just don’t have any inside faces,
polygons have 2 sides, front side and back side,
unity cameras only render front side of the faces, and the backside is transparent. to see the inside of your walls, you have to just model the inside of the wall
i use maya
How to chance it ?
use boxes to build your walls