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German President Joachim Gauck gestures during a visit in the village of Oradour-sur-Glane alongside French president Francois Hollande (R) on September 4, 2013, in the ruins of the church of Oradour-sur-Glane with one of the last survivors of the World War II massacre in the central French village. The town has become a ghostly war crimes museum since Nazi troops burnt it to the ground on June 10, 1944. Six hundred and forty-two original inhabitants were massacred in Oradour and no one knows exactly why. Women and chldren were massacred in the church before their bodies were burnt by a German SS division. Hebras is one of three survivors still alive. NICOLAS TUCAT/AFP/Getty Images ( 522531371 )

From left, German President Joachim Gauck, Robert Hebras, one of the two survivors still alive, French President Francois Hollande and Mayor of Oradour-sur Glane, Raymond Fugier walk through the ghost city of Oradour-sur-Glane, southwestern France, Wednesday, Sept. 4, 2013, where on June 10, 1944, the Nazis massacred 642 civilians. Holding hands in quiet tribute, the presidents of Germany and France are visiting the scene of the largest massacre in Nazi-occupied France nearly seven decades ago. Wednesday's visit by German President Joachim Gauck to the southwestern French town of Oradour-sur-Glane is the first by a serving German leader. (AP Photo/Michel Euler, Pool) ( France Germay WWII )

France's President Francois Hollande, right, German President Joachim Gauck, left, and Robert Hebras, 88, one of the last survivors of the World War II Oradour-sur-Glane's massacre, center, walk in the streets of the French martyr village of Oradour-sur-Glane, southwestern France, Wednesday, Sept. 4, 2013. Holding hands in quiet tribute, the presidents of Germany and France are visiting the scene of the largest massacre in Nazi-occupied France nearly seven decades ago. Wednesday's visit by German President Joachim Gauck to the southwestern French town of Oradour-sur-Glane is the first by a serving German leader. (AP Photo/ Phillipe Wojazer, Pool) ( France Germany WWII )

French President Francois Hollande (R) and his German counterpart Joachim Gauck (L) visit on September 4, 2013 the ruins of the church of Oradour-sur-Glane with Robert Hebras, 88, one of the last survivors of the World War II massacre in the central French village. The town has become a ghostly war crimes museum since Nazi troops burnt it to the ground on June 10, 1944. Six hundred and forty-two original inhabitants were massacred in Oradour and no one knows exacty why. Women and chldren were massacred in the church before their bodies were burnt by a German SS division. Hebras is one of three survivors still alive. YOAN VALAT/AFP/Getty Images ( 522532507 )

French president Francois Hollande (R) and his German counterpart Joachim Gauck give a joint press conference on September 4, 2013 after visiting the ruins of the French village of Oradour-sur-Glane. The town has become a ghostly war crimes museum since Nazi troops burnt it to the ground on June 10, 1944. Six hundred and forty-two original inhabitants were massacred in Oradour and no one knows exacty why. Women and chldren were massacred in the church before their bodies were burnt by a German SS division. Hebras is one of three survivors still alive. NICOLAS TUCAT/AFP/Getty Images ( 522531256 )

French President Francois Hollande (L) and his German counterpart Joachim Gauck hold hands on September 4, 2013 after a ceremony at the cemetery of the central French village of Oradour-sur-Glane. The town has become a ghostly war crimes museum since Nazi troops burnt it to the ground on June 10, 1944. Six hundred and forty-two original inhabitants were massacred in Oradour and no one knows exacty why. Women and chldren were massacred in the church before their bodies were burnt by a German SS division. Hebras is one of three survivors still alive. PHILIPPE WOJAZER/AFP/Getty Images ( 522531417 )

France's President Francois Hollande, right, and German President Joachim Gauck, left, pay respect after laying a wreath at the cemetery of the French martyr village of Oradour-sur-Glane, southwestern France, Wednesday, Sept. 4, 2013. Holding hands in quiet tribute, the presidents of Germany and France are visiting the scene of the largest massacre in Nazi-occupied France nearly seven decades ago. Wednesday's visit by German President Joachim Gauck to the southwestern French town of Oradour-sur-Glane is the first by a serving German leader. (AP Photo/ Phillipe Wojazer, Pool) ( France Germany WWII )

French President Francois Hollande's companion Valerie Trierweiler, left, and German President Joachim Gauck's partner Daniela Schadt attend a ceremony at the cemetery of the French martyr village of Oradour-sur-Glane, southwestern France, Wednesday, Sept. 4, 2013. Holding hands in quiet tribute, the presidents of Germany and France are visiting the scene of the largest massacre in Nazi-occupied France nearly seven decades ago. Wednesday's visit by German President Joachim Gauck to the southwestern French town of Oradour-sur-Glane is the first by a serving German leader. (AP Photo/ Phillipe Wojazer, Pool) ( France Germany WWII )

From right, France's President Francois Hollande, Robert Hebras, 88, one of the last survivors of the World War II Oradour-sur-Glane's massacre, and German President Joachim Gauck, walk in the streets of the French martyr village of Oradour-sur-Glane, southwestern France, Wednesday, Sept. 4, 2013. Holding hands in quiet tribute, the presidents of Germany and France visited the scene of the largest massacre in Nazi-occupied France nearly seven decades ago. Wednesday's visit by German President Joachim Gauck to the southwestern French town of Oradour-sur-Glane is the first by a serving German leader. (AP Photo/ Phillipe Wojazer, Pool) ( France Germany WWII )

French President Francois Hollande (R) and his German counterpart Joachim Gauck (L) visit the ruins of the town on September 4, 2013 with Robert Hebras (C), 88, one of the last survivors of the World War II massacre in Oradour-sur-Glane and the town's mayor Raymond Frugier (R). The town has become a ghostly war crimes museum since Nazi troops burnt it to the ground on June 10, 1944. Six hundred and forty-two original inhabitants were massacred in Oradour and no one knows exacty why. Women and chldren were massacred in the church before their bodies were burnt by a German SS division. Hebras is one of three survivors still alive. ROMAIN PERROCHEAU/AFP/Getty Images ( 522530203 )

Foreground from left, Mayor of Oradour-sur-Glane, Raymond Fugier, German President Joachim Gauck, French President Francois Hollande and Robert Hebras, one of the two survivors still alive, walk through the ghost city of Oradour-sur-Glane, southwestern France, Wednesday, Sept. 4, 2013, where on June 10, 1944, the Nazis massacred 642 civilians. Holding hands in quiet tribute, the presidents of Germany and France are visiting the scene of the largest massacre in Nazi-occupied France nearly seven decades ago. Wednesday's visit by German President Joachim Gauck to the southwestern French town of Oradour-sur-Glane is the first by a serving German leader. (AP Photo/Michel Euler, Pool) ( France Germay WWII )

French President Francois Hollande (L) and his German counterpart Joachim Gauck sign the guest on September 4, 2013 after visiting the central French village of Oradour-sur-Glane, which has become a war crimes museum since Nazi troops burnt it to the ground on June 10, 1944. Six hundred and forty-two original inhabitants were massacred in Oradour and no one knows exacty why. Women and chldren were massacred in the church before their bodies were burnt by a German SS division. Hebras is one of three survivors still alive. YOAN VALAT/AFP/Getty Images ( 522532619 )

French president Francois Hollande (C) and his German counterpart Joachim Gauck (C-R) visit the ruins of the French village of Oradour-sur-Glane. The town has become a ghostly war crimes museum since Nazi troops burnt it to the ground on June 10, 1944. Six hundred and forty-two original inhabitants were massacred in Oradour and no one knows exacty why. Women and chldren were massacred in the church before their bodies were burnt by a German SS division. Hebras is one of three survivors still alive. ROMAIN PERROCHEAU/AFP/Getty Images ( 522531552 )