"Yes, Virginia, there is a Santa Claus."

In 1897, eight-year-old Virginia O'Hanlon wrote a letter to the editor of New York's now-defunct newspaper, The Sun, concerning Santa Claus' existence. In response, Francis Pharcellus Church published the editorial 'Is There a Santa Claus'.  The editorial became the most reprinted English-language editorial in history.

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Virginia's great-grandson appeared with the letter on the Antiques Roadshow in 1997, where the letter was valued at $20,000 – $30,000. You can watch a clip in which the letter was valued here