which landmark built on the site of a former city gate that marked the start of the road from Berlin to the town of Brandenburg an der Havel, is Frederick William II of Prussia responsible for?
Brandenburg Gate
Title: Brandenburg Gate
Passage: The Brandenburg Gate (German: "Brandenburger Tor" ) is an 18th-century neoclassical monument in Berlin, built on the orders of Prussian king Frederick William II after the (temporarily) successful restoration of order during the early Batavian Revolution.  One of the best-known landmarks of Germany, it was built on the site of a former city gate that marked the start of the road from Berlin to the town of Brandenburg an der Havel, which used to be capital of the Margraviate of Brandenburg.
Title: Frederick William II of Prussia
Passage: Frederick William II (German: "Friedrich Wilhelm II."  ; 25 September 1744 – 16 November 1797) was King of Prussia, from 1786 until his death.  He was in personal union the Prince-elector of Brandenburg and (via the Orange-Nassau inheritance of his grandfather) sovereign prince of the Canton of Neuchâtel.  Pleasure-loving and indolent, he is seen as the antithesis to his predecessor, Frederick II.  Under his reign, Prussia was weakened internally and externally, and he failed to deal adequately with the challenges to the existing order posed by the French Revolution.  His religious policies were directed against the Enlightenment and aimed at restoring a traditional Protestantism.  However, he was a patron of the arts and responsible for the construction of some notable buildings, among them the Brandenburg Gate in Berlin.
Title: Werder (Havel)
Passage: Werder (Havel) (official name derived from "Werder an der Havel" ("Werder upon Havel"), colloquially just "Werder"), is a town in the state of Brandenburg, Germany, located on the Havel river in the Potsdam-Mittelmark district, west of the state's capital Potsdam.
Frederick William II of Prussia Brandenburg Gate