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

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.

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.

Olympic medals are very rare and valuable. One is up for sale now and is well over $150,000 already. See why here.