Top of the world's livability rankings yearly, and one morning explains it: imperial grandeur, Swiss order, Austrian warmth, kinder prices. Schönbrunn's 1,441 rooms and free gardens (plus the world's oldest zoo), Belvedere's Klimt Kiss, Stephansdom and the UNESCO-listed cafés (order Sachertorte), and the 1897 Riesenrad at Prater for family evenings. Railjet reaches Salzburg in 2.5h.