If you want well-known masters of photography, then here are two sites.

[Profotos][1] has a lot of narrative about the photographers, with links to photographs.

[Masters of Photography][2] has a lot of images, but the site is littered with pop-up ads, so may put you off

[Atget Photography][3] is a good combination of image galleries and short biographies on a number of master photographers.  It also includes links to worldwide museums and galleries.


  [1]: http://www.profotos.com/education/referencedesk/masters/
  [2]: http://masters-of-photography.com/
  [3]: http://www.atgetphotography.com/The-Photographers/index.html