American Dana Vollmer celebrates after her gold medal win Sunday in the women's 100-meter butterfly swimming final at the Aquatics Centre in the Olympic Park. Matt Slocum/AP hide caption

itoggle caption Matt Slocum/AP

Sasha Feachem (right) will be performing in an urban street dance during the London Olympics' opening ceremony Friday. Tom Goldman/NPR hide caption

itoggle caption Tom Goldman/NPR

The interior of London's Westfield Stratford City Mall measures some 1.9 million square feet. Many of them were recently walked by NPR's Tom Goldman. Tom Goldman/NPR hide caption

itoggle caption Tom Goldman/NPR

Supporters of North Korea's women's soccer team were dismayed to see the start of Wednesday's match delayed, after a video screen displayed the South Korean flag next to photos of the North Korean players. Graham Stuart/AFP/Getty Images hide caption

itoggle caption Graham Stuart/AFP/Getty Images

Brandi Chastain celebrates after kicking the winning penalty shot to win the 1999 Women's World Cup final at the Rose Bowl in Pasadena, Calif., in 1999. Roberto Schmidt/AFP/Getty Images hide caption

itoggle caption Roberto Schmidt/AFP/Getty Images