The charge of the 4th ANZAC Light Horse Brigade at Tel Be'er Sheva was part of a larger British offensive on Oct. 31, 1917. Beginning around dusk, the horse-mounted charge broke through Turkish defenses and seized key terrain. The breakthrough and capture of the town allowed Allied forces to advance on Palestine.

Rusted ammunition remains as a reminder of the U.S. soldiers who died in the Argonne Forest in early Oct. 1918. Often called The Lost Battalion, over 500 soldiers of the 308th Infantry Regiment began their attack on Oct. 3. Only 194 would be rescued five days later.

The remains of a German observation platform for directing artillery fire or sharpshooting.

Chambrey's Gare Imperiale sits at the intersection of grand strategies, military tactics and new technologies in the 1900s. After France's defeat in the Franco-Prussian War, a frontier railway station was built in German-occupied Chambrey in 1873. German military leaders believed that trains, a new technology at the time, could expedite their military mobilization in the event of invasion.

The impact of WWI was felt far beyond European trenches. In Africa, British farmers and settlers volunteered to protect vulnerable railways from German-led guerilla attacks. The British military expanded the railway between Kenya and neighboring Uganda as more soldiers arrived at camps not far from Taveta.

The German cemetery at Nantillois contains the graves of 921 soldiers. Some graves still have their original WWI-era headstones.

The Douaumont Cemetery is France's largest WWI cemetery, holding 16,142 graves. Douaumont’s ossuary also contains the skeletal remains of over 130,000 unidentified French and German soldiers.

Tyne Cot Cemetery is the world’s largest Commonwealth cemetery, with 11,871 graves and 34,926 names that honor those without a burial site. Tyne Cot began as an aid station and small field cemetery. It was redesigned and enlarged, and remains from surrounding burial sites were reinterred there after the Armistice.