Catholics hold bamboo torches during a peace march from the Urakami Cathedral toward the Peace Memorial park in Nagasaki, Japan, on Sunday, August 9, 2015. Seventy years ago, the United States <a href="index.php?page=&url=http%3A%2F%2Fwww.cnn.com%2F2015%2F08%2F04%2Fworld%2Fgallery%2Fatomic-bomb-hiroshima-nagasaki%2Findex.html" target="_blank">dropped atomic bombs on the cities of Hiroshima and Nagasaki.</a> The devastation led to Japan's surrender and brought an end to World War II.
Catholics hold bamboo torches during a peace march from the Urakami Cathedral toward the Peace Memorial park in Nagasaki, Japan, on Sunday, August 9, 2015. Seventy years ago, the United States dropped atomic bombs on the cities of Hiroshima and Nagasaki. The devastation led to Japan's surrender and brought an end to World War II.
JIJI PRESS/AFP/Getty Images
Doves fly over the Statue of Peace at Nagasaki Peace Park.
Doves fly over the Statue of Peace at Nagasaki Peace Park.
Kyodo News/AP
Nagasaki Mayor Tomihisa Taue, second right, and other representatives offer wreaths of flowers during the memorial ceremony.
Nagasaki Mayor Tomihisa Taue, second right, and other representatives offer wreaths of flowers during the memorial ceremony.
JIJI PRESS/AFP/Getty Images
Catholics offer prayers at an early morning Mass on to pay respect to the victims of the atomic bombing.
Catholics offer prayers at an early morning Mass on to pay respect to the victims of the atomic bombing.
Eugene Hoshiko/AP
A girl offers a prayer to the victims before lanterns are placed at the Peace Memorial Park in Nagasaki on Saturday, August 8.
A girl offers a prayer to the victims before lanterns are placed at the Peace Memorial Park in Nagasaki on Saturday, August 8.
JIJI PRESS/AFP/Getty Images
Candles are lit around the Hiroshima Peace Memorial in Hiroshima, Japan, on Thursday, August 6.
Candles are lit around the Hiroshima Peace Memorial in Hiroshima, Japan, on Thursday, August 6.
Kyodo/AP
A boy offers prayer as after releasing a paper lantern into the Motoyasu River on August 6.
A boy offers prayer as after releasing a paper lantern into the Motoyasu River on August 6.
Eugene Hoshiko/AP
U.S. Ambassador to Japan Caroline Kennedy, center, leaves after a memorial ceremony at the Hiroshima Peace Memorial Park on August 6.
U.S. Ambassador to Japan Caroline Kennedy, center, leaves after a memorial ceremony at the Hiroshima Peace Memorial Park on August 6.
Buddhika Weerasinghe/Getty Images
Hiroshima Mayor Kazumi Matsui, right, bows at the Hiroshima Memorial Cenotaph on August 6.
Hiroshima Mayor Kazumi Matsui, right, bows at the Hiroshima Memorial Cenotaph on August 6.
Eugene Hoshiko/AP
People pray in front of the cenotaph during the memorial ceremony.
People pray in front of the cenotaph during the memorial ceremony.
The Asahi Shimbun/Getty Images
People pray in front of the cenotaph.
People pray in front of the cenotaph.
The Asahi Shimbun/Getty Images
A woman holds a photograph as she prays at the Hiroshima Peace Memorial on August 6.
A woman holds a photograph as she prays at the Hiroshima Peace Memorial on August 6.
Chris McGrath/Getty Images
A man prays at the memorial on August 6.
A man prays at the memorial on August 6.
Chris McGrath/Getty Images
A woman prays Wednesday, August 5, at the Hiroshima memorial park.
A woman prays Wednesday, August 5, at the Hiroshima memorial park.
Buddhika Weerasinghe/Getty Images
Foreign visitors rest near the memorial on August 5.
Foreign visitors rest near the memorial on August 5.
Eugene Hoshiko/AP
People visit the Peace Memorial Park to pray for victims of the atomic bombing in Hiroshima.
People visit the Peace Memorial Park to pray for victims of the atomic bombing in Hiroshima.
Kazuhiro Nogi/AFP/Getty Images
People visit the Hiroshima park on August 5.
People visit the Hiroshima park on August 5.
Chris McGrath/Getty Images
A woman overlooks the ceremony site at the Hiroshima park on August 5.
A woman overlooks the ceremony site at the Hiroshima park on August 5.
Chris McGrath/Getty Images
People carry lanterns past the memorial on August 5.
People carry lanterns past the memorial on August 5.
Chris McGrath/Getty Images
People hold lanterns as they walk for peace on August 5.
People hold lanterns as they walk for peace on August 5.
Buddhika Weerasinghe/Getty Images