The rebuilt theater , with its striking contemporary interior design but hidden behind the original facade , was inaugurated on 10 April 1973 with a production of Verdi 's I Vespri Siciliani directed by Maria Callas and Giuseppe Di Stefano .
The opera house was rebuilt an opened in 10 April 1973 with a production of Verdi 's I Vespri Siciliani directed by Maria Callas and Giuseppe Di Stefano .