Hietzing is what Vienna's grand districts look like once you turn the volume down — the imperial city's polite western suburb, a swallowed village that kept its square, with Schönbrunn's quiet gate at the end of the street. Three kilometres, all of it walkable in an afternoon and most of it within sight of the start.
The U4 lands you beside the first treasure: Otto Wagner's Hofpavillon of 1899, the private Stadtbahn station built for the Emperor and hardly ever used — a domed little extravagance, all green and gold. From there into Am Platz, the old village square, where the pilgrimage church of Maria Hietzing still presides over what plainly used to be its own small town.
West along Lainzer Straße for the villa streets — 19th-century houses, the odd Secession flourish on a facade if you look up. The reconstructed Klimt Villa, the painter's last studio, is a short detour and a quiet one.
End at Schönbrunn's Hietzinger Tor, the west gate, where you can walk into the park well clear of the crowds — then the U4 back from where you began.
.jpg&w=3840&q=75&dpl=dpl_FWyMG2bqNuVDf3YbkaNMa1Ahrrjm)