What event, held annually in October since 2002 in Paris, invites the public into 23,000 normally closed sites from embassies to industrial facilities?

• A Nuit Blanche
• B Fete de la Science
• C Journees du Cinema
• D Journees Europeennes du Patrimoine (European Heritage Days) ✓

European Heritage Days were initiated in France in 1984 and have since spread across the continent as a Council of Europe initiative.