Niagara falls - been there too many times to count. It's Canada's version of Vegas. Tacky and over priced. Over run by tourists. But, Niagara on The Lake is stunning. Tiny town up river from the falls.
Lisbon - dirty, tourist traps everywhere and just such a disappointment
Brighton - just no...never again
Brussels- rude locals, and just blah and grey
Detroit- steel city, need I say more
Philadelphia - dirty, boring and could be any major city
Leeds - yuck