Vienna in a Weekend — Hofburg, Schönbrunn, Klimt & Café Culture

The Stephansdom (St Stephen's Cathedral) anchors Innere Stadt — the central first district. Work began in 1137; the 137-metre South Tower (completed 1433) and the 230,000-tile Chevron roof are Vienna's skyline. Enter the nave for free — the Gothic proportions are extraordinary. Climb the South Tower's 343 narrow steps for rooftop views across the city toward the Wienerwald hills; alternatively take the lift to the North Tower for the 21-tonne Pummerin bell. The catacombs beneath hold Habsburg internal organs in copper urns (separate ticket, guided only). Stephansplatz around the cathedral is the transit hub — U1/U3 intersection, horse-drawn fiaker carriages (€55/20 min — expensive but iconic), and a tourist café density to avoid.