The Musée de l’air et de l’espace is one of the oldest aviation museums in the world. Inaugurated in 1919, the museum occupies over 150,000 square meters of land and hangars in Le Bourget airport (IATA: LBG, ICAO: LFPB), 11 km northeast of Paris. The museum holds a vast collection of objects, including about 150 aircrafts, satellites, rockets and aviation-related objects. #AvGeek paradise!
Their collection includes several early 20th century prototypes and a great World War II hall. But the jewels of the crown are the B747-100 on the tarmac and the two Concords (the experimental F-WTSS prototype and Air France F-BTSD) in one of their hangars (named, evidently, the Concorde Hall). I had the opportunity to visit it not so long ago and it was a great experience.