I once spent a few days in Benkulu, on the southern coast of Sumatra. I have never been to a more unpleasant place. The weather, the bugs, the food, nothing about it was nice or interesting in any way. Well- there was this guy selling cut up parts of exotic jungle animals on a blanket on the sidewalk, for black magic uses, that was pretty mindblowing, but I dont know if seeing parrot beaks and monkey tails with blood still on them could be called "interesting" or just weird.
Its the town where Lord Raffles saw three of his children die of tropical diseases. He attempted to abolish slavery and cannibalism there, but really didnt succeed.
Now that is a shithole.
Buenos Aires is one of my favorite cities on earth.