There is a poject, Surveillance under Surveillance, which has been mapping surveillance cameras for more than 10 years. They are mapped in openstreetmap and anyone can add them.

Only a small fraction is maped in my western european country.

Once again OpenStreetMap for the win but obscured from public view. Though I will give MapQuest credit for proper attribution on the camera data view.

They dont show them over here at all, because we are not a police state