German postage stamp
July 20 is a memorial day to commemorate the failed attempt to assassinate Hitler in 1944. The day is not a public holiday but gets quite some attention in politics and media. Lots of books and films have been done about the event, the latest bein "Operation Valkyrie" with Tom Cruise.
The conspiration was the culmination of German resistance against the Nazi regime. Its participants were high-ranking military officers. They planned to take power in Germany after Hitler's death. Claus Schenk Graf zu Staufenberg was the one who was to kill the dictator.
The plan was placing a briefcase with a hidden bomb in Hitler's military headquarters of Wolfsschanze. Unfortunately Stauffenberg hesitated too long and the attempt failed.
No one knows what would have happened, had the new military government successfully been installed. They were officers, would they have continued the war or ended it? Room for speculations. One thing is sure, though: they could not have been worse than Hitler's regime. The assassination could have saved millions of lives.
On that day you will see flags on 'half mast' on all public buildings.