As the most avid collector of his day, Horace Walpole (d. 1797) spent more than 50 years amassing one of the world's greatest art collections. Housed at Strawberry Hill, Walpole's neo-gothic mansion in west London, the vast collection of 10,000 objets d'art and curiosities encompassed everything from paintings by Joshua Reynolds to a pair of gloves once owned by King James I. Now, the hunt is under way to track down thousands of lost items from the collection in the hope of restoring Strawberry Hill to its former glory before it opens to the public for the first time next year.