Boundlessly inventive, Brazilian artist Helio Oiticica turned viewer into participant.

Andy Warhol's complicated and fascinating relationship with the body transformed his art.

This fall, Carnegie Museums celebrates and explores the science and art of the body and our sometimes conflicted relationship with it.

For the last decade, many of National Geographic's most powerful stories have been told by female photojournalists.

Four upcoming projects will challenge artists to activate photography's measurement of light and time to investigate contemporary social issues.