A rare coin could be the key to a small fortune, and it's been causing quite a stir recently. Whether it's the one penny piece hailed as the 'rarest in UK history' or an unusual 20p with a design flaw ...

Certain coins can fetch a hefty sum, even if it is one detail that makes collectors go wild for it. But it's no secret specific rare coins are more desirable than others, whether it's a 20p or 50p.

If you have ever visited Great Britain and returned home with some coins, which is typical for tourists traveling around the world, you may have saved those coins with the idea of returning to England ...