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Wearing gas masks, German soldiers wade through a gas attack by the British, World War I.

Wearing gas masks, German soldiers wade through a gas attack by the British, World War I.

German troops ready for the offensive, Verdun, 1916.

German troops ready for the offensive, Verdun, 1916.

German cavalry, World War I.
Verdun, 1916.
Rheims Cathedral in Rheims, France is swallowed by a cloud of smoke during a bombardment in 1917. 2014 photo by Peter Macdiarmid.
You can see more here: http://www.pbs.org/newshour/updates/images-world-war-devastation-overlaid-modern-photos-france/#the-rundown
Members of a Royal Garrison Artillery of the British Army carry duck-boards across the frozen Somme canal at Frise, March 1917. 2014 photo by Peter Macdiarmid.
You can see more here: http://www.pbs.org/newshour/updates/images-world-war-devastation-overlaid-modern-photos-france/#the-rundown
Les Halles in the Belgium town of Ypres was the site of three major battles during World War I, and was almost completely devastated by bombing in 1915. 2014 photo by Peter Macdiarmid.
You can see more photos like this here: http://www.pbs.org/newshour/updates/images-world-war-devastation-overlaid-modern-photos-france/#the-rundown
The town hall and belfry of Arras, France is seen from the main square in this archive photo of destruction wrought during WWI. The date of the photo is unknown, but the belfry was destroyed on October 21, 1914. Medieval tunnels under the city, which were expanded during the war, were pivotal in helping British forces to hold the city. 2014 photo by Peter Macdiarmid/Getty Images.
U.S. aviator cowling used during World War I.
British, American, Russian, Hindu, German, French, Austrian or Hungarian, Italian Bersagliere and Japanese soldiers during the Boxer Rebellion, 1899-1901.