can't see mesh in camera view First I have a huge scene 

Then I addea a camera and I chose that given view and pressed clt+Alt+numpad 0
then it shows like this

I tried increasing decreasing focal length,size of camera,shift+f to move my camera but nothing worked anyone got a idea??please share if you know,, your answer is highly apprecited
The Problem is that the camera is too far away for the default camera to see.

To fix this, change the clipping under the camera settings to something higher until you can see the object you are looking for. Depending on how far away the object is, you might have to set it quite high.