[NOTE: for the "Rumsey Historical Maps" you must be running the
latest Google Earth 4 (released November 1st). Download here.
Also, you may have to change the
"Tools>Options>General>LanguageSettings" to "English".] Google
has quietly introduced four new Featured Content Layers today.
Go to the Layers on the lower left and look for “Featured
Content“. Open the folder and look for the new layers at the
top. Each is marked with a red “New!“. Here’s a brief overview
of the new layers: - Rumsey Historical Maps – This is a
collection of historical maps which you can overlay over their
location on Earth. If you are not running Google Earth 4, you
will not see this layer. Open the folder and turn on the map
that interests you. The first link shows you the locations of
the different map and each description gives you a few details.
You can then turn on each map and they will be overlayed in GE.
The maps are “regionated” which means they will load more detail
as you get closer (it also means the images are scanned at a