The Ringstraße replaced Vienna's obsolete city walls and moats, which dated back to the 13th century. Measuring 500m wide, the walls were reinforced as a consequence of Turkish assaults which began in the first half of the 16th century. The Ringstraße and its planned buildings, parks, were meant to showcase the grandeur of the Hapsburg Empire -- and perhaps rival the wide boulevard construction which had begun in Paris. The architectural examples are splendid -- neo-classic, neo-gothic, neo-renaissance, neo-baroque, neo-romantic.
An architectural movement of the late 18th and early 19th centuries, Greek Revival was the last phase of Neoclassical architecture. A product of Hellenism, a result of revived access to Greece (as well as the rise of archeology), Greek Revival took on different forms and styles in Europe -- most often in a craving for Greek style, interior design and furniture. As far as timing goes, Austria's Parliament is a rather late adaptation of Greek Revival. The building and fountain were erected during the reign of Franz Joseph I, near the end of the Hapsburg dynasty (Parliament 1874-1883, Athena Fountain 1893-1902) .