On May 26, 2016, schoolchildren look at an old photograph of the Atomic Bomb Dome before the bombing in Hiroshima, Japan, standing across the river from the still-standing ruins. #

Emiko Okada, 79, a survivor of the atomic bombing of Hiroshima, poses at the Hiroshima Peace Memorial Park in Hiroshima on May 25, 2016. Okada was about 2.8 kilometers (1.7 miles) from ground zero and suffered severe injuries in the blast in 1945, while her sister died. #

The hands of Sunao Tsuboi, a survivor of the atomic bombing of Hiroshima and an anti-nuclear and anti-war activist, as he poses at an office in Hiroshima on May 26, 2016. Tsuboi was on his way to university when the bomb exploded over Hiroshima in a flash of blinding light and intense heat on August 6, 1945. #

Park Nam-Joo, 83, an ethnic Korean survivor of the atomic bombing of Hiroshima who suffered from breast and skin cancer after being heavily exposed to radiation following the bombing in 1945, at the Hiroshima Peace Memorial Park, on May 25, 2016. An estimated 20,000 Koreans were among the dead in Hiroshima and accounted for more than 10 percent of the total number. #

Misako Katani, 86, who was exposed to radiation in Hiroshima and Nagasaki, at a nursing home in Hiroshima Prefecture on May 26, 2016. Katani, who survived the Hiroshima blast August 6, 1945, was then again exposed to radiation in Nagasaki shortly after that city was bombed on August 9. #

Taken April 10, 2016, tourists walk past a deer after being asked to leave the Itsukushima Shrine area, prior to a visit by G7 foreign ministers and U.S. Secretary of State John Kerry who took a cultural break from their meetings in nearby Hiroshima for a visit to Miyajima Island. #

Keiko Ogura, 78, a survivor of the atomic bombing of Hiroshima in 1945, posing at the Hiroshima Peace Memorial Park on May 25, 2016. Ogura has devoted her life to keeping alive the memory of the devastating day by sharing her experiences with visitors to the memorial park. #