Adolf Hitler is perhaps the most feared and despised man of the 20th century. Not surprisingly, there were over 40 documented attempts on Hitler's life.

Assassins ranged from simple craftsmen to high-ranking soldiers in the Fhrer's own military. Aided by cutting-edge CGI, security experts explain why the plots failed; and using modern weapon and explosive experiments, determine what slight change could have made the missions successful.

Historians theorize how history would have been altered had just one of the killers eliminated Hitler.

Adolph Hitler, it seems, wasn't well liked. This documentary from National Geographic examines the numerous historical plots to kill the Fuhrer and why they floundered. The program's panel of experts also discusses how these plans might have succeeded-and how Hitler's assassination might have changed history.