Will the stars turn out for a sale of Polish artist Tamara de Lempicka's work in New York? Elsewhere, a J M W Turner masterpiece goes under the hammer and the 1930's sports car which every eligible bachelor had to have is sold at Blenheim Palace.

A limestone carved head by the tragic sculptor Amadeo Modigliani is up for sale in Paris. It is estimated at six million euros, but certain art experts expect it to fetch much more. But will it make that much? In London, the art of travel goes under the auctioneer’s hammer, a rare violin is estimated at half a million and Earl Spencer clears out his stately home in the yard sale of the century.

A grand silver wine cistern is the headline lot in a sale of exquisite ‘treasures’ in London. Elsewhere, Princess Diana’s black dress, discovered by its designer in a trash bag, gets the bidders excited. American radios from the 1930s spark interest from collectors and, in Paris, the art collection of Ambroise Vollard is sent to auction 70 years after it was locked in a bank vault and forgotten.

In London, the entire contents of one man’s apartment, designed to replicate an 18th century period piece, are offered up for sale. Elsewhere, an Irish nobleman decides to sell off some of the family silver to keep his castle wind and watertight. And, in Paris, a bicycle made in 1941 by a hero of the French resistance fetches a record price.

The cars are the stars in a sale of classic automobiles at the Goodwood Festival of Speed. They include an immaculate pre-war Bentley, dubbed the ‘Silent Sportscar’. In London, twentieth century British art goes under the hammer featuring a painting by Winston Churchill and a little-known work by the artist Lowry, bought in 1946 for $35. But what will it fetch today?

Would you pay over £30,000 for a handbag? Some people will, especially if it’s connected to the actress Grace Kelly. The splendor of Venice comes to London in the sale of a collection amassed from the palazzos of La Serenissima. In Connecticut, all eyes are on the yellow Rolls Royce which Robert Redford drove in The Great Gatsby. But what will a collector pay for this star of the silver screen?

He was one of the greatest figures of the twentieth century. Winston Churchill is remembered in a sale of memorabilia, including his earliest known portrait and a cigar which he gave to an admirer. Russian art comes to London in an auction of exquisite jewel boxes made by craftsmen in St Petersburg. And everything from old telephones to a miniature fairground go under the hammer at a unique sale.

Brian Hollins started collecting Hornby toy trains before the Second World War. He made it a passion for life and now his entire collection is up for sale, including some of the rarest model locomotives in the world. In London, there’s a sale of Old Masters, and New York’s auction houses sell off some of the oddest twentieth century furniture that needs to be seen to be believed.

The Duke of Devonshire is having a clear out. The contents of attics in Chatsworth House in Derbyshire come under the hammer along with items from the long-demolished Devonshire House in London. Elsewhere, memorabilia from the world of film and entertainment is up for sale, including a Darth Vader costume from Star Wars. But how much will a film fan be willing to spend?

The Duchess of Windsor’s jewels come up for sale in London and there’s expected to be fierce bidding for items connected to the love story of Edward and Mrs Simpson. Elsewhere, the work of the nineteenth century naturalist John James Audubon comes under the hammer. Could his huge portfolio of American birds become the most expensive book ever to be sold at auction?