In what was once the old Jewish ghetto, construction workers discovered the fascinating remains of a 13th-century synagogue while digging for a new parking garage. Simon Wiesenthal (a former Vienna resident) helped to turn it into a museum dedicated to the Austrian Jews who died in World War II. Marking the outside is a concrete cube whose faces are casts of library shelves, signifying Jewish love of learning, designed by Rachel Whiteread. Downstairs are three exhibition rooms devoted to medieval Jewish life and the synagogue excavations. Also in Judenplatz is a statue of the 18th-century playwright Gotthold Ephraim Lessing, erected after World War II.