Although not at the level of flea markets in western Europe it is worth a while to visit an witness the non tourist side of Zagreb.
The main market takes place on every Sunday and the best part is that you never know what you are going to see :). Cheep (really cheep) retro clothes from the wardrobes of pensioners trying to get some more money to boost their pension, Gypsies selling piles of clothes from who knows where, books, comic books, old furniture, computers (when is the last time you have seen a ZX Sepectrum or Comodore 64), LPs (who knows they may even work), military medals from socialist era, every equipment you need to make a barbecue for 50 people, and all of this surrounded by the smell of huge amounts of čevapćići, pljeskavice, kotlovina and similar food to feed all the visitors.
Probability of someone speaking English is low (except for the young) but that should not stop you. Even if you do not buy anything just walking around it is an experience in it self.
If you are going in the summer expect heat and dust.
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