About a week after the opening ceremony of the 1996 Summer Games in Atlanta, a bomb went off in Centennial Park. Two died and more than 100 were injured, but the games went on. Pedro Ugarte/AFP/Getty Images hide caption

itoggle caption Pedro Ugarte/AFP/Getty Images

Migrants ride on top of a northern bound train toward the U.S.-Mexico border in Oaxaca, southern Mexico, in March. Migrants crossing Mexico to get to the U.S. have increasingly become targets of criminal gangs who kidnap them to obtain ransom money. Eduardo Verdugo/AP hide caption

itoggle caption Eduardo Verdugo/AP

NPR reporter Jason Beaubien walks on railroad tracks while reporting a story about the dangers that face Central American migrants in Tenosique, Tabasco, Mexico. David Rochkind for NPR hide caption

itoggle caption David Rochkind for NPR

Chef Lao Wei Xiong cooks up a carry-out order for foreign reporters in the kitchen at al Maida restaurant in Tripoli. NPR hide caption

itoggle caption NPR

A Saudi woman crosses in front of several automobiles in a marketplace on Sept. 16, 1990, in Dammam. Women in Saudi Arabia are not allowed to drive, have little say in matters of marriage and divorce, and cannot travel without a letter of permission from their male guardian. David Longstreath/AP hide caption

itoggle caption David Longstreath/AP

The last time NPR's Eric Westervelt saw backpacker Billy Six, he was at Benghazi's port trying to catch a boat ride to the besieged city of Misurata. Nasser Nasser/AP hide caption

itoggle caption Nasser Nasser/AP

Libyan women hold pictures of leader Moammar Gadhafi in Tripoli earlier this month during a protest against the U.N. resolution authorizing a no-fly zone. The government, says NPR's David Greene, wants Tripoli to seem like a place full of people who revere Gadhafi. There are signs, however, that Gadhafi's grip on the capital could be loosening. Mahmud Turkia/AFP/Getty Images hide caption

itoggle caption Mahmud Turkia/AFP/Getty Images

Decades ago, the border fence near the port of entry at Nogales, Ariz., and Nogales, Mexico, was made of wire mesh. Now it's a thick steel wall covered with graffiti. Loosely translated, this part of the wall says "Walls Equal Death," although the end of the phrase is not shown. Claudio Sanchez/NPR hide caption

itoggle caption Claudio Sanchez/NPR

As winter approaches, Bill Thompson gave Melissa Block's backyard in Washington, D.C., a bird feeding makeover. "It's the time of year most folks start feeding actively, cause we get a lot of the northern birds coming down for the winter, to what they feel is our milder climate," he says. Here, an Eastern bluebird sits on an icy feeder. Bill Thompson III hide caption

itoggle caption Bill Thompson III