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
Buddhism in Europe a ceremony attended by Carla Bruni-Sarkozy. The largest temple in eastern Europe is the Golden Temple in Elista, the capital of Kalmykia, which was opened in December 2005. The highest stupa in the area is the 30-meter-high stupa in Zalaszántó, Hungary. Samyé Ling monastery in Scotland, which celebrated its 40th anniversary in 2007, includes the largest Buddhist temple in western Europe. There is an associated community on Holy Isle which is owned by Samyé Ling who belong to the Kagyu school of Tibetan Buddhism. The settlements on the island include the "Centre for World Peace and Health" and a retreat