'Antiques Roadshow' Blockbuster $1 Million Treasure Trove

A woman inherited a collection of rare baseball cards and now has hit a home run.
1:48 | 08/13/14

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Transcript for 'Antiques Roadshow' Blockbuster $1 Million Treasure Trove
Finally tonight, as they say no when to hold 'em no when to show them. A woman inheriting old baseball cards at one point turning down $5,000 for them. Smart. Because tonight what are they worth? Here's ABC's linsey Davis. Reporter: At first glance, you might not size her up as a baseball enthusiast. This woman on an upcoming episode of antiques road show has just hit a home run. Holy smokes. Reporter: In her possession, this collection of professional baseball cards passed down through five generations, cards so rare, experts didn't even believe they still existed. This archive was the most exciting I'd seen. Reporter: The owner's great great grandmother ran a boarding house in Boston in the 1870s, back when the Boston red sox were known as the red stockings, and she housed the players. The grand slam, a letter to the land lady, with notes from three hall of famers, about how they missed her cooking. Those cards now worth -- At least $1 million. Reporter: It's not the first time regular folks have stumbled on a hidden treasure. Like the man who bought this painting, covering a hole in his wall for $30 and later sold it for $1.25 million. Or this, one of the original copies of the declaration of Independence, bought at a thrift shop for $2.48, worth hymn $500,000. New reason to search the attic tonight, and study that heirloom. Is it historically important? Is it rare? What is behind it? We love this. And she's keeping the cards. She has no plans on selling it. She will keep it as it has been for decades all in the family. Pass it down to future generations, linsey Davis with us tonight. That is the broadcast.

This transcript has been automatically generated and may not be 100% accurate.

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