Most expensive house / mansion in the world sold for USD 750M in Nice, France. Nice is the seat of the Chambre de commerce et d’industrie Nice Cote d'Azur. It manages both the Nice - Cote d'Azur Airport and the Cannes - Mandelieu Airport, as well as the Port of Nice. Nice has the second market of national interest in France and the country's first port cement manufacturer. It also has a large number of museums and hotels. Investors from France and abroad can benefit from the assistance of the Cote d'Azur Economic Development Agency Team Cote d'Azur. Among tourists, Nice is the second most popular French city after Paris, a fact which, combined with the difficulties of terrestrial communications at long distance (partly because of the Alps), allows it to have the second busiest airport in France in terms of passenger numbers (close to 10,000,000 passengers in 2005). Nice has one conference centre: the Palais des Congres Acropolis. The city also has several business parks, including l'Arenas, Nice the Plain, Nice Maridia, Saint Isidore, and the Northern Forum. In addition, the city features several shopping centres such as Nice Star, Nice TNL, Nice Lingostiere, Northern Forum, St-Isidore, the Trinity (around the Auchan hypermarket) and Cape 3000 with Saint-Laurent-du-Var. Sophia Antipolis is a technology park northwest of Antibes. Much of the park is within the commune of Valbonne. Established between 1970 and 1984, it primarily houses companies in the fields of computing, electronics, pharmacology and biotechnology. Several institutions of higher learning are also located here, along with the European headquarters of W3C. The park is named after Sophie Glikman-Toumarkine, the wife of French Senator Pierre Laffitte, founder of the park, and incidentally, Sophia, the goddess of wisdom. The second half of the park's name is derived from Antipolis, the ancient Greek name of Antibes.