i "heart" stock photo sites

ok, Corbis is the coolest stock photography site. they have the most f*cked up stuff on there. here is one image that i found today:



but this is my favorite:



where do they get this stuff? i wish i could use these images in a book. someone must have used them at some point, right? why else would they be available.

these are from Granger, another stock photo site. they have more historic illustrations:


this is called "Jews/Heretics burned alive."


this is london during the plague. rock and roll.

these drawings, while horrible, are truly a slice of life from the 15th century.