National Treasures: The Art of Collecting

The great art collectors of the world reveal their most valuable treasures, starting with a collector of Islamic art who has amassed 35,000 pieces.

In Venice we explore the late Francesco Carraro's remarkable collection of Venetian glass, which includes works by the much-lauded Carlo Scarpa.

David Lewis is Britain's greatest collector of Old Masters. Here he shows us his favourites on his walls at home.

Art collector Frank Cohen gives a tour of his warehouse, which houses works by Georg Baselitz, Frank Auerbach, LS Lowry, Edward Burra and Patrick Heron.

A look at six watches from a vast collection spanning 300 years, including a watch made in London the year before the Great Fire.

In Venice we see both the art collection and jewels of Attilio Codognato, who has made pieces for everyone from Elizabeth Taylor to the Duchess of Windsor.

The late Roger Thérond was the picture editor of Paris Match and here we examine his private photograph collection from the earliest years of photography.

Art collector Patrizia Sandretto Re Rebaudengo shows us the paintings she has chosen to hang in her own home and reflects on the state of collecting today.

The nephew of the pre-war painter Edward Le Bas - gives a fascinating tour of his extensive art collection.

A fascinating look at the collection of late artist and collector Cecil French, offering a unique window into the world the Pre-Raphaelites.