Here's my list

The Burning Monk, 1963
A Vietnamese Buddhist monk allowed himself to be set on fire and burnt to death on the streets of Saigon to protest the South Vietnamese governments treatment of the Buddhist population of South Vietnam.

The falling man, 2001
One of the worst terror attacks in history that left nearly 3000 people dead and 6000 more injured. During the attacks of September 11, people trapped in the WTC towers had the horrific choice of burn to death, or jump…

Into the jaws of death, 1944
US Army 1ID in their beach assault of Omaha sector of the Normandy landings, not a horrific photo for its content, but a horrific photo because we know what followed, an emotional and awe inspiring photograph. Truly, the greatest generation.

Execution of Kiev Jews, 1942
The SS Einsatzgruppen, murdering Jews outside the city of Kiev during the second world war. The holocaust took the lives of some six million Jewish people and is still regarded as one of the worst genocides in the history of man

The beheading of an Australian soldier, 1943
Leonard Siffleet was an Australian Special Forces radio operator sent to Papua New Guinea on a mission, but was captured by locals and turned over to the Japanese, after weeks of torture, he and his fellow servicemen (3 in total) were bonded, blindfolded and beheaded.

The Burnt Baby, Date unknown.
In what is relatively unknown to the western world, Japan committed thousands of attrocities and war crimes in China throughout WWII, below a young child, severely burnt, sits in a train station in Shanghai after it has been bombed out in what was known as “Bloody Saturday”

The effect of Mustard Gas, 1918
What would appear to be a Commonwealth soldier, most likely British, the after effects of the deadly chemical agent, Mustard Gas, which was used by both sides in WWI, it would seep into the lungs and tear apart the inside tissue, it would burn skin like acid and leave horrible scars such as below… The war to end all wars they said.

Napalm Girl, 1972
When an ARVN pilot mistook the fleeing civilians for NVA and dropped cannisters of Napalm, they didn't realise that they would create arguably one the most iconic war photos ever. The girl suffered 3rd degree burns over some 30% of her body, this photo greatly contributed to the US abandoning the war in Vietnam.

The lynching of two African Americans, 1930
Thomas Shipp and Abram Smith, charged with the murder and alleged rape of two separate persons, whilst it was proven that the two murdered Claude Deeter, the rape allegations (which sparked the mob lynching the two) was withdrawn when Mary Ball (the accuser) later testified she had lied about it. Some may call it justice, but they were killed because the crowd believed they raped someone, they were murdered on falls grounds.

King Leopold II, 1885?
In what is a lesser know atrocity similar to that of the Holocaust of WWII, the enslavement of the ironically named “Congo Free State” saw an estimated 8–10 Million people killed, and hundreds and thousands of people tortured, mutilated and disfigured.

I would go on, but for the sake of not making this post too long ill leave it at here.

“There is no justice among men” ~ Nicholas II, The last Tsar of Russia.