I shouldn't really write a separate post about Zemun. That's because Zemun is a municipality of Belgrade. But, Zemun has been part of Belgrade for only 86 years. For many past centuries, it was a completely independent city.
The main reason why I decided to write a separate post is because, when you go to Zemun, it feels like being in a completely different place. The last time I was there it was over 30 ...