Smithsonian has open's images to the online world. 2.8 million images from the Smithsonian are available to do with it as you choose. Free. Where do you go easy: www.si.edu/openaccess
The treasures that have been released for everyone to use is what makes the Internet Great.
Where to begin is what makes this difficult. I remember I was on in DC on business and swung by Air & Space near Dullas Intl. I was on a call with Tokyo while standing in front of the Enola Gay.
History is amazing. Thanks to the Smithsonian for enabling all to connect to our rich worldwide history.