So many negative comments. Honestly, do your homework, use some common sense and be realistic about what you want to do/can afford. A bit of preparation will help to avoid disappointment. I have loved New York, plus all of the following in Europe:
Rome, Venice, Florence, Milan, Lucca, Siena, Padua, Verona, Bologna.
Vienna.
Paris, Avignon, Reims, Lyon, Metz, Nancy.
Berlin, Munich, Konstanz, Heidelberg, Freiburg.
Basel, Geneva, Zurich.
Barcelona, Palma, Seville, Madrid.
Brussels, Bruges, Ghent, Antwerp.
Amsterdam, Utrecht, The Hague.
Dubrovnik, Split.
Athens.
Dublin.
Stockholm.
Copenhagen.
Prague.
Marrakesh, Cape Town (I know they're in Africa!).