Why is the camera going inside my mesh, when the camera is not inside? I found an answer to a problem, and I thought it would be good to post.  I was having a problem where when I hit ctrl-alt-0, Instead of going to the view of the camera, it would go inside a mesh itself.  I did not have any hidden cameras either.
The answer to this problem is simple.  Blender has a feature where you can select an object, hit ctrl-0, and that object becomes the "camera."  Thus, the camera view was inside my object.  This is pretty neat!  I'm not sure how to use it in a beneficial way, but it must be good for something.
If you want to set the camera view back to your original camera, select your camera and hit ctrl-0.