As leaders of the Group of Seven richest democracies kick off their summit Friday in Hiroshima, Japan, with a visit to the city's Peace Memorial - a massive outdoor monument that captures the devastation caused by the atomic bomb - they pledged their commitment to "achieving a world without nuclear weapons with undiminished security for all."
The leaders met a bomb survivor and laid wreaths at a cenotaph honoring the victims, in sight of the Genbaku Dome, the only structure left standing following the attack by U.S. forces in August 1945 that killed 140,000 people by the end of the year.