High Resolution Images under Public Domain?

[prosigner]

Hey everyone,

I was wondering if you guys knew of any places to find high resolution images under the Public Domain such as this one for example;

http://en.wikipedia.org/wiki/File:Plan_de_Turgot.jpg

Very large sizes that we are interested in, around 6500x5000 - and under the Public Domain.

I am also searching and if I find a good source I will post it here for everyone else to see also.

Thanks a bunch you guys!

 

[the graphics co]

Library of Congress website, http://www.loc.gov

 

[Fred Weiss]

Nasa.gov

 

[Salmoneye]

Thought I would give this a bump as I enjoyed the first two responses so much.