"Monaco City is the southcentral ward in the Principality of Monaco. Located on a headland that extends into the Mediterranean Sea, it is nicknamed The Rock.
The name "Monaco City" is misleading: it is not itself a city, but a historical and statistical district. It holds most of the country's political and judicial institutions: the Prince's Palace, the town hall, the government, the National Council, the Municipal Council, the courts and a prison.
Despite being located in the middle of the City of Monaco, the world's most densely populated urban center, Monaco City remains a medieval village at heart, made up almost entirely of quiet pedestrian streets and marked by virtual silence after sundown.
Though innumerable people visit Monaco City and the palace square, only local vehicles are allowed up to the Rock, and gasoline-powered motorcycles are prohibited after 10 p.m." Courtesy of Wikipedia