Two centuries, three kilometres, and a hard cut between them. Sankt Marx is where Vienna keeps its quietest cemetery and, a short walk on, where it parked four enormous gas tanks and later moved people into them.
Begin at the Sankt Marxer Friedhof, closed in 1874 and never modernised — the only Biedermeier Friedhof left in the city, headstones tilting under unpruned trees. Climb to Mozart's memorial grave, which marks roughly where a common grave swallowed him in 1791; the exact spot is lost, and that's somehow the right note. Come in May and the lilac takes over entirely.
Then east, and the centuries lurch. The St. Marx media quarter is all glass, the T-Center's hull curving overhead; the old Marx Halle nearby still wears its 1881 cast iron from the cattle-market days.
Finish at the Gasometer — four brick drums from 1899, hollowed out and refitted as flats and a mall around the turn of this century. Walk the linked atria, look up at the riveted shells, and take the U3 home from the station built into the wall.
