The skull of a deceased person is placed on an embroidered cloth inside an ossuary before it is being cleaned as part of an annual ritual to honour the dead, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

A man carries the remains of a deceased family member, placed on an embroidered cloth and inside an ossuary, after cleaning the bones, as part of an annual ritual to honour the dead, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

People visit the graves of their deceased family members, to clean their bones and place them on an embroidered cloth inside an ossuary as part of an annual ritual to honour the dead, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

A woman lights a candle for her deceased family members after cleaning the remains and placing them on an embroidered cloth inside an ossuary, as part of an annual ritual to honour the dead, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

The skulls of deceased people are placed on an embroidered cloth inside an ossuary after they were cleaned as part of an annual ritual to honour the dead, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

Benancio Tuz Chi, undertaker of the Pomuch cemetery, looks at the remains of a deceased person before cleaning them and placing them back on an embroidered cloth inside an ossuary, as part of an annual ritual to honour the dead, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

Benancio Tuz Chi, undertaker of the Pomuch cemetery, cleans the remains of a deceased person as part of an annual ritual to honour the dead, cleaning their bones and placing them on an embroidered cloth back into their ossuary, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

Benancio Tuz Chi, undertaker of the Pomuch cemetery, cleans the remains of a deceased person as part of an annual ritual to honour the dead, cleaning their bones and placing them on an embroidered cloth back into their ossuary, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

The skull of a deceased person is placed on an embroidered cloth inside an ossuary before it is being cleaned as part of an annual ritual to honour the dead, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

Benancio Tuz Chi, undertaker of the Pomuch cemetery, places the skulls of deceased people on an embroidered cloth into an ossuary after cleaning them, as part of an annual ritual to honour the dead, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

Benancio Tuz Chi, undertaker of the Pomuch cemetery, cleans the jaw of a deceased person as part of an annual ritual to honour the dead, cleaning their bones and placing them on an embroidered cloth back into their ossuary, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

Benancio Tuz Chi, undertaker of the Pomuch cemetery, cleans the skull of a deceased person as part of an annual ritual to honour the dead, cleaning their bones and placing them on an embroidered cloth back into their ossuary, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

Benancio Tuz Chi, undertaker of the Pomuch cemetery, cleans the skull of a deceased person as part of an annual ritual to honour the dead, cleaning their bones and placing them on an embroidered cloth back into their ossuary, in Pomuch, Mexico October 23, 2022. REUTERS/Lorenzo Hernandez 

Chinese Vice Minister of Veterans Affairs Chang Zhengguo lays flowers near the remains of Chinese soldiers, who were killed in the 1950-53 Korean War, during ceremonial rites to place the remains into the coffin, ahead of its repatriation, at a temporary military ossuary in Incheon, South Korea September 15, 2022. Jung Yeon-je/Pool via REUTERS 

Chinese officials bow to the remains of Chinese soldiers, who were killed in the 1950-53 Korean War, during ceremonial rites to place the remains into the coffin, ahead of its repatriation, at a temporary military ossuary in Incheon, South Korea September 15, 2022. Jung Yeon-je/Pool via REUTERS 

A Chinese military officer salutes in front of a coffin containing the remains of Chinese soldiers, who were killed in the 1950-53 Korean War, during ceremonial rites to place the remains into the coffin, ahead of its repatriation, at a temporary military ossuary in Incheon, South Korea September 15, 2022. Jung Yeon-je/Pool via REUTERS 

A member of South Korea's Agency for KIA Recovery and Identification arranges the remains of Chinese soldiers, who were killed in the 1950-53 Korean War, during ceremonial rites to place the remains into the coffin, ahead of its repatriation, at a temporary military ossuary in Incheon, South Korea September 15, 2022. Jung Yeon-je/Pool via REUTERS 

The remains of Chinese soldiers, who were killed in the 1950-53 Korean War, are seen, ahead of its repatriation, at a temporary military ossuary in Incheon, South Korea September 15, 2022. Jung Yeon-je/Pool via REUTERS 

Members of South Korea's Agency for KIA Recovery and Identification arrange the remains of Chinese soldiers, who were killed in the 1950-53 Korean War, ahead of its repatriation, at a temporary military ossuary in Incheon, South Korea September 15, 2022. Jung Yeon-je/Pool via REUTERS 

The remains of Chinese soldiers, who were killed in the 1950-53 Korean War, are seen, ahead of its repatriation, at a temporary military ossuary in Incheon, South Korea September 15, 2022. Jung Yeon-je/Pool via REUTERS 

A restoration expert collects medieval bone remains in an effort to preserve the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

Visitors observe the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

A restoration expert walks through the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

Visitors observe medieval human skulls at the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

Medieval human skulls and bones are piled up at the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

Medieval human skulls and bones are piled up at the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

Medieval human skulls and bones are piled up at the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

A restoration expert collects medieval bone remains in an effort to preserve the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

Medieval human skulls and bones are piled up at the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

A restoration expert collects medieval bone remains in an effort to preserve the Sedlec Ossuary in Kutna Hora, Czech Republic, February 19, 2019. Picture taken February 19, 2019. REUTERS/David W Cerny 

A restoration expert collects medieval bone remains in an effort to preserve the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

An archaeologist collects human bones as part of a restoration work in an effort to preserve the Sedlec Ossuary in Kutna Hora, Czech Republic, February 14, 2019. Picture taken February 14, 2019. REUTERS/David W Cerny 

A restoration expert collects medieval bone remains in an effort to preserve the Sedlec Ossuary in Kutna Hora, Czech Republic, February 19, 2019. Picture taken February 19, 2019. REUTERS/David W Cerny 

A restoration expert sorts medieval bone remains in an effort to preserve the Sedlec Ossuary in Kutna Hora, Czech Republic, February 19, 2019. Picture taken February 19, 2019. REUTERS/David W Cerny 

A restoration expert carries a box containing medieval bone remains at the Sedlec Ossuary in Kutna Hora, Czech Republic, February 19, 2019. Picture taken February 19, 2019. REUTERS/David W Cerny 

A restoration expert sorts medieval bone remains in an effort to preserve the Sedlec Ossuary in Kutna Hora, Czech Republic, February 19, 2019. Picture taken February 19, 2019. REUTERS/David W Cerny 

A woman walks among the tombstones at the cemetery outside the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

A woman walks among the tombstones at the cemetery outside the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

A woman walks among the tombstones at the cemetery outside the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

A French soldier's tombstone is seen in the early morning light at the cemetery outside the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont Ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont Ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont Ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont Ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont Ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont Ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

French soldiers tombstones are seen in the early morning light at the cemetery outside the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 7, 2018. REUTERS/Christian Hartmann 

Barbed wire is seen near the grave of an unknown French soldier at the "Tranchee des Baillonettes" (Trench of Bayonets) monument of Douaumont near the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, in Verdun, France, November 5, 2018. Picture taken November 5, 2018. REUTERS/Christian Hartmann 

A man walks among the tombstones at the cemetery outside the WWI Douaumont Ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 5, 2018. Picture taken November 5, 2018. REUTERS/Christian Hartmann 

A man walks among the tombstones at the cemetery outside the WWI Douaumont Ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, near Verdun, France, November 5, 2018. Picture taken November 5, 2018. REUTERS/Christian Hartmann 

The grave of an unknown French soldier is seen at the "Tranchee des Baillonettes" (Trench of Bayonets) monument of Douaumont near the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, in Verdun, France, November 5, 2018. Picture taken November 5, 2018. REUTERS/Christian Hartmann 

The grave of an unknown French soldier is seen at the "Tranchee des Baillonettes" (Trench of Bayonets) monument of Douaumont near the WWI Douaumont ossuary, as France prepares to mark the centenial commemoration of the First World War Armistice Day, in Verdun, France, November 5, 2018. Picture taken November 5, 2018. REUTERS/Christian Hartmann 

French President Emmanuel Macron walks at the cemetery by the Ossuary of Douaumont during ceremonies marking the centenary of World War I, near Verdun, France November 6, 2018. Francois Mori/Pool via REUTERS 

French President Emmanuel Macron is flanked by students as he pays his respects at the Douaumont Ossuary, in Douaumont, France November 6, 2018. Ludovic Marin/Pool via REUTERS 

French President Emmanuel Macron is flanked by students as he pays his respects at the Douaumont Ossuary, in Douaumont, France November 6, 2018. Ludovic Marin/Pool via REUTERS 

French president Emmanuel Macron and his wife Brigitte Macron walk with French Junior Minister for Defence Genevieve Darrieussecq (R) and French Junior Minister to the Minister of Territorial Cohesion and Relations with Territorial Communities, in charge of territorial communities Sebastien Lecornu (back) at the Douaumont National Necropolis and Ossuary during ceremonies marking the centenary of the First World War, near Verdun, France November 6, 2018. Etienne Laurent/Pool via REUTERS 

French president Emmanuel Macron and his wife Brigitte Macron walk with officials and students at the Douaumont National Necropolis and Ossuary during ceremonies marking the centenary of the First World War, near Verdun, France November 6, 2018. Etienne Laurent/Pool via REUTERS