Hello,
When importing a model from 3ds max in .fbx format I can not see in the interior of the walls.
[Photo]
What should I do?
The problem is the normal.
You can only see one side of the polygons but in 3D max they show both sides.
Try turning on back face culling in your 3D application then it look like it does in unity.
To fix the model just invert the normal of the models faces.
No, still nothing
Well - if you want to see ‘inside’ the hallway you can apply a shader and increase the transparency on them.
But @fffMalzbier is mostly correct - invert/flip the normals on the mesh and re-export. In Unity the hallway will look weird from afar, but when the camera is placed correctly in the hallway, it will look like a floor, walls and a ceiling.
An alternate (expensive) approach is to use a double sided material, so both sides of the polygon are visible.
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Okay, I found. Thank you very much 
Here is the link, as if someone was looking for: