Vienna
The world's most liveable city for four years running pairs Habsburg architecture with the most extensive urban tram and U-Bahn network in the German-speaking world, all running on 100% renewable Wiener Linien power. The Innere Stadt and Schönbrunn are both UNESCO-listed, the MuseumsQuartier is the eighth-largest cultural complex in the world, and the Danube island (Donauinsel) gives 21 km of car-free riverbank for swimming and cycling. Hotels around Neubau and Leopoldstadt cluster around the Austrian Ecolabel.
Highlights: Innere Stadt (UNESCO) · Schönbrunn Palace & gardens · MuseumsQuartier · Donauinsel cycling & swimming