The Heldenplatz ("Heroes' Square") is a historical plaza in Vienna. Many important actions took place here, e.g. Adolf Hitler's announcment of the Anschluss of Austria to the German Reich in 1938.
The Heldenplatz is the outer plaza of the Hofburg and was built under the reign of Emperor Francis Joseph, as part of what was to become the Kaiserforum (imperial forum), which, however, was never completed. In the northeast, it is bordered by the Leopoldinian Tract of the Hofburg, in the southeast by the New Hofburg, and in the southwest by the Ringstraße, from which it is separated by the Äußeres Burgtor (Outer Castle Gate). The northwestern part, where there are no buildings, offers a view of the Ringstraße with the Austrian Parliament, the Vienna Rathaus (Town Hall), and the Burgtheater.
On the plaza, there are the two equestrian statues of Prince Eugene of Savoy and Archduke Charles of Austria, who are remembered as great military leaders.

Text Source: Wikipedia