Monaco is the most expensive, followed by London, according to research by Knight Frank and Citi Bank.
As far as Spain goes, South-West Mallorca is the most expensive place, 33rd in the world ranking, followed by Madrid at 36, and Ibiza at 47.
About Mark Stücklin
Mark Stücklin is a Barcelona-based Spanish property market analyst, and author of the 'Spanish Property Doctor' column in the Sunday Times (2005 - 2008). He can be reached by email on firstname.lastname@example.org. All articles published in good faith as a general guide but no substitute for professional advice. Please read the SPI disclaimer