Judenplatz holds a library nobody can read. Rachel Whiteread cast it in concrete: a block ten metres by seven, no taller than a single storey, its outer walls made of shelves of books turned back to front. The double doors are solid concrete, cannot open, and have no handles. It stands for more than 65,000 Austrian Jews murdered by the National Socialists between 1938 and 1945, and the camps they were sent to are cut into its base.
Underneath lie the foundations of the Jewish quarter's synagogue, pulled down in 1421 after the city's Jews were burned, forcibly baptised or driven out. In 1998 the city shifted the memorial a metre so that it would not stand on the synagogue's reading platform, and marked the platform's outline in the paving instead. The square is small and closed in by house fronts, one side taken by a baroque palace that now holds a high court. On the house at number 2, a stone relief and a Latin verse from about 1500 still celebrate the killings of 1421.