The Buffalo Pan-American Exposition saw the killing of a president. The fair is also famous among stamp collectors for inspiring one of the most well-known among US stamp errors.

An upside down ship makes this commemorative stamp one of the most famous and valuable American postal errors of all. Find ...

Lionel Messi's locker could be yours. If you have $350,000. Find out more about the Nou Camp sale that ends this month.

A drawing on hospital paper made with matchstick charcoal could be worth $200,000. Find out why outsider art is such a big ...

A print of a legendary and tragic image of John Lennon is being sold this month. Find out why the notorious picture could be worth $30,000.

A Star Wars production model might make £30,000 at auction. Find out why this Obi-Wan Kenobi toy is so valuable here.

Carlos Santana loved and played this Paul Reed Smith double-neck guitar. Find out why it is expected to realise up to $150,000 at auction here.

A 110-metre hurdles gold medal won in the 1904 Olympic Games in St Louis is being sold this month and has already attracted bids of just under $170,000. The gold award is a 39mm disc both designed and ...