If we asked you to name the most significant thing about this picture, you'd probably say "The fact that everyone's wearing the same hat." However, there are two historically important things about it: First, this was taken on August 2, 1914, at Munich's Odeonsplatz, and it shows the cheerful reaction of a German crowd in the plaza during the announcement of World War I, because there's no way something like that could go wrong for them. Remember, at this point words like "Nazi" and "Holocaust" meant nothing to the German people.
The second thing is that within this crowd, there's a subtle hint of the terror that awaits the country -- take a closer look at the man in the circle and see if you recognize him ...
"World war? Now there's an idea."
Yep, that's a 26-year-old Adolf Hitler looking stoked that his country is going to war, or possibly asking people if they like his new mustache. He's two decades away from hijacking the nation into Nazism and leading them into an even more devastating global conflict.
You can't see his legs, but judging from that haircut, he must have been wearing cigarette jeans.