I don't have a bucket list, but I do develop a great desire to see some things once I start researching a place -- for instance, I'll be going to Greece for the first time this November, and I've made up my mind to see at least some of the Metora monasteries. I'd never heard of them before, and now I MUST see them when I'm there.
My first view of Sagrada Familia (because that's what you do in Barcelona) 6 or7 years ago was so shocking, I said (without even thinking about it) "that's the most butt-ugly church I've ever seen." It seems Gaudi is not to my taste, though Barcelona did introduce me to Joan Miro, whose work I really like.