This year marks the 50th anniversary of this prestigious annual exhibition of award-winning photojournalism, which opens in Amsterdam before travelling onto 80 cities worldwide. This year's overall winner is Arko Datta (Reuters, India) with a photo showing a woman mourning a relative killed on the Boxing Day tsunami in Cuddalore in India. As usual, a retrospective of the winner’s work will be on show alongside the other award-winning photos (divided into themes). Additionally, there will be a 50 Years Gallery featuring all the winning shots from the past half-a-century. Although the exhibition can often be confronting (there is something intrinsically powerful about a still - as opposed to moving - image) it remains a veritable hommage to the photo-journalist who often works in life-threatening conditions to report the news.