Photography

A split image shows Allen Ginsberg in 1953 and 1967. Allen Ginsberg LLC/Corbis | The National Portrait Gallery hide caption

Vietnam veteran Sid Mills, a Yakima man, stands guard. Owen Luck hide caption

Mahmud, at his vineyard in Wadi Fuqin, Palestinian territories Leeor Kaufman hide caption

Hanami (flower viewing), Sakura (Cherry Blossom Festival), Maruyama Park, Kyoto, Japan Diane Cook and Len Jenshel/National Geographic hide caption

12-year-old boy with his father, 2009 Sage Sohier hide caption

Carnegie Lake, Australia, 1999 Carnegie Lake in Western Australia fills with water only during periods of significant rainfall. In dry years, it is reduced to a muddy marsh. Flooded areas appear dark blue or black, vegetation appears in shades of dark and light green, and sands, soils and minerals appear in a variety of colors. NASA hide caption

Part four delves into the world of people who live in 24-hour Internet cafes because they can't afford rent. Courtesy of Shiho Fukada/Panos Pictures hide caption

If it were a movie, it would be called The Third Wheel by Orson Welles Topical Press Agency/Getty Images hide caption

President Obama delivers his State of the Union address last year. On Tuesday night, he will be back at the Capitol for another address to a joint session of Congress. Getty Images hide caption

Even in the springtime snowfall buries the city. Tomeu Coll hide caption

Kyrgyz girls slide plastic jugs back to their family's camp after chopping a hole in a frozen spring to fetch water. Men handle herding and trading; much of the hard labor of daily life falls to the females. Matthieu Paley/National Geographic hide caption

A boy hitches a ride on a suitcase as he waits to board a train at Beijing West Railway Station during Chunyun travel peak on Feb. 8, 2007. China Photos/Getty Images hide caption

Quarterback Len Dawson in the Chiefs' locker room, Super Bowl I, 1967 Bill Ray/Time & Life Pictures/Getty Images hide caption

A view of the Grand Canyon captured by the Google Trekker Google hide caption