Go to the TerraServer website if you would like to see aerial photos
and topographic maps of the United States including border areas with
Canada and Mexico. The black and white aerial photos are detailed
enough to see customs posts and boundary lines.
One example is near North Derby, Vermont, United States. The
boundary running along the 45th parallel can be seen from left to
right in the middle of the photo.
http://terraserver-usa.com/image.aspx?t=1&s=12&x=907&y=6234&z=18&w=2
http://terraserver-usa.com
Xachary