October 26,2011. St.Petersburg,Russia.Maria Callas Forever Exhibition dedicated to legendary opera singer Maria Callas. The exhibition, showcasing the singer’s letters, documents, stage costumes, evening gowns and personal possessions, opened at the Sheremetevsky Palace of St.Petersburg as part of the second Diaghilev. P.S. international arts festival. Pictured: fan, venetian jewellery box and diadem of Maria Callas .