In the jungles of Vietnam where order and discipline hung by a thread, some officers faced a danger greater than the Viet Cong: their own men.

He was an arctic explorer, a scientist, and a humanitarian who saved upwards of 7 million people. The biography of Fridtjof Nansen almost defies belief.

Descended from German nobility, von Stauffenberg thought it his duty to defend his nation against threats both inside and out. Hitler became one such threat.

Though his reports almost immediately made the New York Times' Bestsellers list, his research was very much not without its critics.

The peacekeeper's death has eluded investigators for nearly 60 years, but new evidence may have finally named his murderer.

Literally 'Storm Unit,' the SA was once a group of specialized troops under Imperial Germany — until Hitler assembled them en masse to intimidate his political opponents.

By some accounts, the slave army was ultimately defeated because of Crixus' "arrogance and presumption."

David Livingstone went farther than any European had gone in Africa in European history, but his explorations would have devastating consequences.

In an affluent New York suburb, 17-year-old Ricky Kasso brutally murdered a fellow teen fueled by LSD and an obsession with Satan.

He was demoted, discriminated against, and gravely injured. Perhaps worst of all, he wasn't recognized for his outstanding service until it was too late.