The United Nations is currently exhibiting the superlative photographs of James Nachtwey depicting the pain and suffering of people afflicted with AIDS and tuberculosis.
A poignant passage about the exhibition from the article in the New York Times:
"In Thailand, north of Bangkok, he (Nachtwey) came across an American priest named Michael Bassano who spends endless days with the most desperate of AIDS patients, massaging their feet, changing their diapers, helping them die. Their flesh clings like cellophane to their bones, and their eyes roll up in their heads. In one photograph Father Bassano’s arm just barely extends into the lower right corner of the frame, clasping the tiny wrist of a young woman named Lek. She stares doe-eyed back at him, as if from the grave."
Here's the whole article (registration might be required).
