Who was the architect of the opera house where Thaïs was first performed?
Palais Garnier The Palais Garnier (] French    ) is a 1,979-seat opera house, which was built from 1861 to 1875 for the Paris Opera. It was called the Salle des Capucines, because of its location on the Boulevard des Capucines in the 9th arrondissement of Paris, but soon became known as the Palais Garnier, in recognition of its opulence and its architect, Charles Garnier. The theatre is also often referred to as the Opéra Garnier (French    ) and historically was known as the Opéra de Paris or simply the Opéra, as it was the primary home of the Paris Opera and its associated Paris Opera Ballet until 1989, when the Opéra Bastille opened at the Place de la Bastille. The Paris Opera now mainly uses the Palais Garnier for ballet.
Her Majesty's Theatre Her Majesty's Theatre is a West End theatre situated on Haymarket in the City of Westminster, London. The present building was designed by Charles J. Phipps and was constructed in 1897 for actor-manager Herbert Beerbohm Tree, who established the Royal Academy of Dramatic Art at the theatre. In the early decades of the 20th century, Tree produced spectacular productions of Shakespeare and other classical works, and the theatre hosted premieres by major playwrights such as George Bernard Shaw, J. M. Synge, Noël Coward and J. B. Priestley. Since the First World War, the wide stage has made the theatre suitable for large-scale musical productions, and the theatre has specialised in hosting musicals. The theatre has been home to record-setting musical theatre runs, notably the First World War sensation "Chu Chin Chow" and the current production, Andrew Lloyd Webber's "The Phantom of the Opera", which has played continuously at Her Majesty's since 1986.