Here the narrator is talking about what she perceives as the male instinct to overpower and possess.
Parliament Square, London, is the location of the statues of many well-known statesmen including Winston Churchill and Abraham Lincoln.
The Sieges Allee, or Siegesallee (German for 'Victory Avenue') was a boulevard in Berlin. It was famous for its numerous white marble statues (commisioned by the Emperor William ll) of members of the Prussian royal family. The statues were moved during the period that Adolf Hitler was in power and many were subsequently damaged in World War ll.
Both Parliament Square and the Sieges Allee, therefore, are seen as symbols of male strength, supremacy, and boastfulness.