I just found out I'm going on a trip in a few months that's not on my schedule. The problem is I have no idea where I am going. It's a mystery trip to a new country I have not yet visited, and the person planning it will only give me a list of 3 destinations to narrow it down (that's my only clue). My question: Is there one thing that stands out in these places that is something I should definitely not miss? A landmark, attraction, etc.? At least when I get to where ever it is I am going I will have some ideas of what to do and see there. Possible destinations: Rome (I doubt this because I have been to Italy before - Pisa and Florence) Barcelona Istanbul Thanks.