Europe of population are Saint Petersburg, Madrid, Berlin and Rome, each having over 3 million residents. When considering the commuter belts or metropolitan areas, within the EU (for which comparable data is available) London covers the largest population, followed in order by Paris, Madrid, Barcelona, Berlin, the Ruhr area, Rome, Milan, Athens and Warsaw. "Europe" as a cultural concept is substantially derived from the shared heritage of the Roman Empire and its culture. The boundaries of Europe were historically understood as those of Christendom (or more specifically Latin Christendom), as established or defended throughout the medieval and early modern history of
World's largest palace World's largest palace The title of the "world's largest palace" is difficult to award, and controversial, as different countries use different standards to claim that their palace is the largest in the world. The title of "world's largest palace by area enclosed within the palace's fortified walls" is held by China's Forbidden City complex in Beijing, which covers an area of 728,000 square meters (180 acres). The 980 buildings of the Forbidden City have a combined floor space of and contain 9,999 rooms (It was because that ancient Chinese thought the yuhuang god has 10000 rooms, they made 9999 and