The 10 Most Cruel Leaders in All of History

From Renaissance predictors like Nostradamus, who wrote of the death of kings and the rise of evil, to 20th-century mystics like Rasputin, who foresaw the fall of a dynasty, are some predictions more than lucky guesses?

Most of the world's holiest places sit in plain sight, able to be seen and experienced. But there are some hidden deep underground.

The introduction of the scientific method transformed society by using science and reason rather than political or religious dogma.

Beneath the streets of Paris, France, are the bones of more than 6 million people in what's known as the Paris Catacombs.