One of the quietest horrors I've ever felt was this one weekend in Istanbul when I was walking home alone at 2am, down a very busy main street (Istiklal), and slowly realized that every single other person on the street was a man.
the feeling of searching through the crowd with increasing worry to find another female face and not seeing any was just one of the weirdest, most unsettling experiences of my life
The reason it was scary was because women weren't on the street for a reason. I was the only person of that group who didn't know the reason. I probably would be worried also if the same thing had happened with race.
So gender roles in some countries are weird. I don't know why women weren't out, but I was under the impression it wasn't just that night, that they were expected to stay indoors after a certain time in general.