Théâtre Marigny is one of the most expensive nights out for theatregoers in Paris. But then not many other theatres can boast so much: a location off the Champs-Elysées; a deluxe interior conceived by Charles Garnier (of Opéra fame); high-profile casts and an illustrious pedigree stretching back 150 years. Productions have included the French adaptation of Equus; Juliette Binoche's IN-I had its debut here in 2009.