A few cities that have been associated with having expensive houses include: 1. Monaco: This tiny principality on the French Riviera is known for its luxury real estate market, with limited space and high demand driving property prices to astronomical levels. 2. Hong Kong: The limited land availability and high population density in Hong Kong have led to incredibly high property prices, making it one of the most expensive cities for real estate. 3. London: Certain areas in London, particularly in affluent neighbourhoods like Kensington, Chelsea, and Mayfair, have some of the world's priciest homes due to their desirability and international appeal. 4. New York City: Manhattan, particularly neighbourhoods like Billionaires' Row and the Upper East Side, is home to some of the most expensive real estate in the United States and the world. 5. San Francisco: The Bay Area's tech boom and limited space have contributed to sky-high property prices in San Francisco and its surrounding areas. 6. Los Angeles: Luxury neighbourhoods such as Beverly Hills, Bel Air, and Malibu make Los Angeles another city where high-end properties command top prices.