Note, links to outside websites open in a new tab so you don't lose your place on Grahique Du Jour
Wikipedia: The History of Photography
Science & Media Museum of the UK: The History of Photography portrayed in an image collection
Identifying 5 Rare Types of Antique Photos: Daguerreotype, Ambrotype, Tintype, Cartes de Visite & Cabinet Cards
PBS: A detailed timeline of photographic history beginning 1826 and noting every influention invention and discovery.
A Brief History of Photography: Beginning with the Camera Obscura and covering the major periods of development up to the present.
1926 Article: 50 years of photography