Old Maps Online — Gateway to historical maps in libraries around the world

Above, "A Map of the Coast of New England from Staten Island to the Island of Breton."

From the website: "The LUNA Browser is the primary way to view the [David Rumsey] map collection. Users can browse the entire online collection of over 30,000 images or search by keyword for specific images. Images may be exported or saved in groups. Or you can browse by categories or use the what, where, who, when links on the left side of the thumbnail pages."  

Fair warning: There goes the day.

[via Internet Scout Project and Richard Kashdan]