In the late 1930's, Adolf Hitler's storm troopers marched into Czechoslovakia and the Jewish population found itself on the Nazi hit-list.
That is, until a young British stockbroker named Nicholas Winton went to Prague and saw for himself the plight of the children.
For nearly 50 years, Winton hardly spoke of what he'd done – saving 669 children, most of them Jewish, from certain death.
He has since reunited with some of those children, now all grown up, and many with children of their own.
Winton has just turned 105.
Click above to watch.