SimCity Type game issues...

I am trying to develop a sim city type game. However I want to be able to create extremely large cities. For example i want the world size to be the size of Alaska. My approach is to have every scene limited to 1000x1000 units, the scene that the camera is in will be full detail, but the camera must be able to view the scenes around it, ie a 3x3 matrix of scenes where the camera is in the centre scene. the other 8 scenes outside will be of lower quality.
is there any example code for this type of scenario. I am not sure how the camera can see other scenes.

 

A camera cannot see other scenes. Only one scene can be loaded at any given time.

 

Not true, you can use LoadLevelAdditive.

 

One solution is to create different areas inside the scene, with different scales. Use different cameras for each area.