Schoolchildren reading from Mao's Little Red Book during the Cultural Revolution in communist China in the 1960s

Grand Duchess Elizabeth Fedorovna, 1885. A granddaughter of Queen Victoria of Britain, she married Grand Duke Sergei Alexandrovich of Russia

🏴󠁧󠁢󠁳󠁣󠁴󠁿 The streets of Kilmarnock, Scotland, c. 1890s

U.S. Senator Alben W. Barkley views the bodies of prisoners after the liberation of Buchenwald concentration camp in April 1945. 56,000+ prisoners perished at this camp during its period of operation. On April 11, 1945, US forces liberated Buchenwald. General Eisenhower left everything untouched for a number of days so a visiting group of US legislators could truly understand the horror of the atrocities.

Illustration of the Battle of Mohi between the Mongol Empire and the Kingdom of Hungary during the Mongol invasion of Europe, April 1241. The battle resulted in a victory for the Mongols, who destroyed the Hungarian Royal army.

Children walk arm in arm down a dirt road by a corn field, Pennsylvania, 1919

🇪🇸 Townspeople under the arches of the 1st century Roman Aqueduct in Segovia, Spain, 1911. The aqueduct bridge used no mortar or cement between the 20,400 blocks of stone, which remain standing solidly today.

Dutch civilians cheer as the British roll into Arnhem, WWII, April 1944

While on a tour of the newly liberated Ohrdruf concentration camp, General Dwight Eisenhower and other high-ranking US Army officers view the bodies of prisoners who were killed during the evacuation, Germany April 1945. The Ohrdruf camp was a subcamp of the Buchenwald concentration camp, and the first Nazi camp liberated by US troops.

An Irish family by their cottage, c. 1900

A man standing with piles of buffalo skulls, Michigan Carbon Works, Rougeville Michigan, 1892. Due to irresponsible over-hunting and shooting bison for sport, by the late 1800s their numbers had plummeted from around 30 million to a mere 325, marking a catastrophic decline.

Members of the French Resistance being taken for execution after a trial before a German military tribunal, Paris, 14 April 1942

🇫🇷 A view of Paris in the 1920s (original autochrome colour photo)

German soldiers partying on the Eastern front after a few drinks, 1942

🇺🇸 Washington National Guard cavalry pictured in Tacoma, Washington in 1907.

British Prisoners of War celebrate their liberation from Stalag X1B in Germany, 16th April 1945. (colourised)

Medieval illustration of the coronation of Stephen III, who ruled as King of Hungary between 1162 and 1172.

Army square in Cattaro, Austro-Hungary, 1890s (now Kotor, Montenegro)

A group of children with books at a kindergarten, 1930s

Mass Grave #3 of the Bergen-Belsen concentration camp, photographed by a British soldier after the camp's liberation in April 1945 by the British 11th Armored Division. The soldiers discovered approximately 60,000 prisoners inside, most of them half-starved and seriously ill, and another 13,000 corpses lying around the camp unburied. From 1941-1945 around 70,000 people died at this camp.