Sankt Marx: the Biedermeier graves and the gas tanks
Mozart's lost grave, the only Biedermeier cemetery left, and four gasometers turned into a town. This is a Claude-drafted route awaiting the editor's walk.

1. Sankt Marxer Friedhof
Start at the gate off Leberstraße. Closed in 1874 and frozen ever since — Vienna's only preserved Biedermeier *Friedhof* (cemetery), leaning headstones under old trees. If you come in May the lilac is the whole reason; the avenues go purple and the scent does the rest.

2. Mozart's memorial grave
Up the central path, near the top of the slope. Mozart was buried somewhere in this ground in 1791 in an unmarked common grave; nobody knows quite where. The broken column and the leaning angel mark the spot the cemetery later chose. Stand there anyway — it's close enough.

3. St. Marx media quarter
East out of the cemetery into the glass-and-steel of the media and biotech campus — the T-Center's great curved hull is the landmark. A hard switch of centuries in a few hundred metres, which is the point of doing the two together.

4. The Marx Halle
The cast-iron former cattle-market hall, 1881, now an events and design space. Pop in if a fair's on; otherwise the engineering of the roof is the thing. A reminder this whole district was once where the city's meat arrived.

5. Gasometer
South-east to the four brick *Gasometer* — gas tanks from 1899, each the size of an arena, gutted around 2001 and rebuilt inside as flats, a mall, a concert hall. Walk through the linked atria; the Victorian shells over the modern cores are genuinely strange.

6. Gasometer U3
The U-Bahn station is built into the complex — you barely step outside to catch it. U3 back into the centre in minutes. End with a coffee in the mall if the contrast with the cemetery hasn't worn off.

Sankt Marx: the Biedermeier graves and the gas tanks