Since its inception, TIME magazine has been synonymous not just with outstanding journalism, but also with outstanding photography. Now, to mark the 175th anniversary of photography and the birth of photojournalism, the Editors of TIME magazine are publishing this companion book to the groundbreaking digital celebration of photography that TIME.com will be mounting online, displaying the most influential photographs of all time.

While they may not be the most famous or well-known photographs, each one is unique for the way in which it changed, influenced, or commemorated a particular world event. From the first sports photograph to ever win the Pulitzer Prize - that of Babe Ruth at Yankee Stadium to the photograph of Student Neda Agha-Soltan's death during Iran's 2009 election protests, each of the photographs in 100 Photographs: The Most Influential Images of All Time is significant in how it forever changed how we live, learn, communicate, and in many cases, view the world.