We found a bunch of great postcards in the Boston Public Library’s Flickr photostream and here is one of our favorites.

Daybreak over Washington, D.C.
Daybreak over Washington, D.C.
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Source: Flick user Boston Public Library

Here is another great one, showing the Washington Monument.

The Washington Monument at night
The Washington Monument at night
[Click here for larger version.]

Source: Flickr user Boston Public Library

And another great one of the Capitol Building.

The Capitol Building at night
The Capitol Building at night
[Click here for larger version.]

Source: Flickr user Boston Public Library