Vienna

Must-see attractions include Schönbrunn Palace, Hofburg Palace, St. Stephen's Cathedral, the Belvedere Palace (home to Klimt's 'The Kiss'), the MuseumsQuartier, and the Spanish Riding School.

The shoulder seasons (April-May and September-October) offer pleasant weather, fewer crowds, and are ideal for sightseeing. The Christmas markets in November and December are also a popular draw.

Vienna has an excellent public transportation system, including the U-Bahn (subway), trams, and buses. The Vienna Pass offers unlimited travel and free entry to many attractions. Walking is also a great way to explore the city center.