A few great photography links that I have enjoyed browsing of late.

US National Park Service Historic Photograph Collection


Life Beneath Antarctic Ice - Photo Essays - TIME


Secret Buildings You May Not Photograph, Part 643


An Amazing Close-Up Photograph Of A Rainbow (via)


The Wind That Swept Mexico: the history of the Mexican Revolution 1910-1942. 184 historical photographs assembled by George R. Leighton.


Flickr: The High Speed Photography Pool


Stephen Shames Photography. Award winning photo essays on social issues.