According to International Precious Metals, only 2,000 were produced, and even fewer are known to exist today—hence their hefty worth. One of these coins once fetched $6.6 million at auction, while ...

Turns out there's an even more sought-after version of the iconic 2009 Kew Gardens coin. The silver 50 Pence Piece is a ... But, coming across an ultra-rare gold version will be a much more ...

Of course, if you think you have any rare or high-value ... you might think a highly coveted coin from ancient Greece would cost millions of dollars, the U.S. Gold Bureau listed it for only ...