Inspect them for mistakes/errors. Collectors love rare pieces, and nothing shouts one of a kind like mistakes minted on ...

The bills listed here come from data gathered by US Currency Auctions and include the ultra-rare and valuable 1861 10-dollar bill. A 10-dollar bill wasn't always the size it is today. Older bills ...

It was originally based on the Spanish Dollar ... United States Mint, but that doesn’t keep them from being valuable. They’re valued at about $4,750,000. Despite their name, these rare ...