decay as art? artists who use the subject of decay?

i'm looking for names of artists and photographers who use decay (whether urban, such as ruined buildings and streetscapes, or biological, like... rotting bodies?) i've decided to use the subject as a starting point for my art theory unit this semester, but i'm having some trouble finding artists...

 

Salvador Dali used images of rotting animal and human bodies quite extensively in his surrealist film "Un Chien Andalou." I don't know if you were including film in the "artists and photographers" category, but this would be a good example.
Here's the film: (Parts 1 and 2)
https://www.youtube.com/watch?v=51CBW6os3rk
https://www.youtube.com/watch?v=vFryAwwAhIE&feature=related