Bangkok. Nothing but indistinct tall buildings, traffic and seediness. Hated it.
Beijing. Or at least when I was there- during the worst smog of the year. It was disgusting. Only part I enjoyed was the Temple of Heaven, and even then I could barely breathe.
Paris. Shithole. Or so I thought so as a 13 year old. I will go back to see if I've matured or if I was correct. I did buy Daft Punk's Discovery on CD from a hypermarket there though, every cloud.
Glasgow. Might get lynched for this but had a horrible time, didn't meet a friendly soul despite its reputation. Did get a double battered sausage supper from a chippy though which was a highlight.