Scholars explore the witch trials of 17th-century Salem, Massachusetts, uncovering fresh clues about the town's dark past.

In 1864, during a failed raid to rescue northern prisoners of war, papers are discovered that order the assassination of Confederate president Jefferson Davis.

The flu pandemic of 1918 was the hidden apocalypse of the 20th century, killing as many as 50 million people worldwide. It likely began in America and was more deadly than World War One.

Newly declassified intelligence documents paint a new picture of the attack on Pearl Harbor, including information regarding a spy ring that funnelled American intelligence and stolen technology to the Japanese Navy, making the attack possible.

In 1982, satellites detect a massive explosion in the Siberian wilderness. New evidence reveals this may have been a CIA operation, utilising the newly emerging field of computer viruses to get revenge on the Soviet Union.

Polish-born General Pulaski probably saved George Washington's life, and became known as the father of American cavalry. DNA tests, however, reveal that he was most likely intersex.