The Newseum in Washington, DC is dedicated to the first amendment. The exhibits change from time to time, but the underlying theme, at east as I personally understand it, is how journalism, and photojournalism in particular, both reflects our lives and changes our lives by framing the terms of public discourse in a Democracy. The trip is well worthwhile for anyone interested in these themes. One aphorism on the walls states that journalism is the first rough draft of history.