Biggest disappointment for me was Buenos Aires. A once great city with decay and food reminiscent of 1970s America with better steak.
On the other hand, I did my honeymoon in Turkey, and it exceeded my expectations. Istanbul was cleaner and friendlier than Paris or Rome.
I don't get the appeal of Disneyworld, nor understand people who take every vacation there.
Ephesus made a great impression on me at age 17 and I didn’t even know much of the history behind it. The bus along the coast (beautiful) was an exercise in how many bad accidents can you count.