4. Vienna, Austria
Vienna is the largest city in Austria and is a city that attracts and lures from scratch. There is an apparently never-ending abundance of things to do and view throughout the year, and it is also both culturally and musically one of the prosperous cities in the world. It has continually ranked among the top 5 cities for high quality life, in the studies by Mercer. If you get a chance to go there, you should not miss out on palaces of Schönbrunn and Hofburg and an abundance of art treasures in some great museums such as Museum of Fine Art, Belvedere, Albertina and Leopold Museum.