Brazil, 1966. Two men in suits were found dead on a hill, surrounded by odd notes, and wearing lead eye masks. With no sign of violence, police were baffled. Theorists linked the m...

In 1973, author and activist Oscar Zeta Acosta told his son he was getting on a boat, and would see him soon. But Acosta was never seen again. Theories range from a drug deal gone ...

In May 2000, 32-year-old Australian astrophysicist Rodney Marks died suddenly on an Antarctica base after falling ill just 36 hours earlier. The National Science Foundation (NSF) r...

Teenager Jane Grey was never supposed to be Queen of England. But in 1553, a complex conspiracy put her on the throne. A year later, another conspiracy led to her death. Historians...

In 1976, a military coup led to an authoritarian regime in Argentina. The military and its new leader, Lieutenant General Jorge Rafaél Videla, then launched a campaign to eradicate...

In the mid-19th century, British-occupied Ireland lost roughly one-third of its population during a years-long catastrophe known as “The Great Hunger” or, “The Irish Potato Famine....