Old Maps

Boston 1775 has a post where the author discusses an old map of Boston from 1894 with a map from when Europeans first arrived superimposed on it. A large portion of Boston is built on landfill.
The area around Old North Church (the church that figured prominently in the midnight ride of Paul Revere) existed when the Europeans first arrived.
I think it's neat to look at old maps to see which streets existed 100 years ago. There are some streets like that in my hometown, because it predates the suburbanization of Long Island.