For two months, the survival of Vienna hung on a few hundred metres of wall, and this walk follows right along it.
Europe's most famous composers lived here in rented rooms, and hardly any of them owned a house.
Vienna called this neighborhood the matzah island, and in one night in 1938, its end began.
Within a single square kilometre, a handful of thirty-somethings turned European art, music and architecture on its head.
For fifteen years, Vienna built palaces for workers—and then its own army opened fire on them.
A village, a zoo dating back to 1752, and a ruin that was never whole, all surrounding the largest palace in the country.