I've been to many good exhibitions but Hubert de Givenchy at Museo Thyssen-Bornemisza so far was one of the best ones I've ever seen. Dresses for celebrities such as Audrey Hepburn or Greta Garbo were breathtakingly beautiful. Hubert de Givenchy is a great and talented designer. The one who marks the 20th century and goes in haute couture history. You must see it to believe it.