This is a really hard question to answer (we loved them all!), but I would have to say Austria, Switzerland and the United Kingdom. I know, I can't narrow it down more than this. I could break it down like this: Nature/Scenery: Austria and Switzerland. The mountains are stunning and we especially loved Hallstatt, Interlaken and Zermatt. City: London and Vienna were my favorite big cities. I still miss London SO much and it felt like home as we stayed there for one month. I also really loved Graz, Bath, Cambridge, Oxford and Edinburgh.