The Rwandan Genocide in 1994. Over the course of approximately 100 days over 500,000 people were killed according to a Human Rights Watch estimate.Estimates of the death toll have ranged from 500,000–1,000,000.It was the culmination of longstanding ethnic competition & tensions between the minority Tutsi,who had controlled power for centuries & the majority Hutu peoples who had come to power in the rebellion of 1959–62. http://en.wikipedia.org/wiki/Rwandan_Genocide
Throughout history, people have suffered an enormous number of forms of death. In 982 Sigurd the Mighty of Orkney strapped the head of his defeated foe to his horse’s saddle. As he rode, the teeth of the decapitated head grazed against his leg and ultimately caused a fatal infection.
Graves of a Catholic woman and her Protestant husband, who were not allowed to be buried together.
Josef Rudolf Mengele, known as the "Angel of Death", was a German SS officer and a Physician who performed "medical experiments" in the Auschwitz death camp.
Italy’s most ghoulish site, this crypt houses thousands of corpses, fully dressed and hung from hooks. The practice began in 1599 when local priests mummified a holy monk and allowed visitors. Soon regular residents of Palermo wanted to be remembered in this fashion. Bodies are arranged by gender and profession; their facial expressions often eerily visible.