30 photos that changed the world

John Aravosis had this to say
An amazing collection. Look through them, you'll hear yourself saying "oh, that one."

This, however, is one I'd never seen:

Federal Dead on the Field of Battle of First Day, Gettysburg, Pennsylvania; Mathew Brady, 1863
One of the earliest war photographs, this sobering look at the war ravaging America remains one of the most important war images of all time.

*****

We have seen the photo above numerous times and are not sure it should be on the list in the first place - there are more intense examples to remind us of what war really is and what it really costs.