The Smithsonian Institution's National Portrait Gallery has purchased what is believed to be the earliest ever photo of a US first lady.
The daguerreotype - an image created through the first photographic process - shows former First Lady Dolley Madison, the wife of the fourth US president, James Madison, BBC reported.
The photograph, discovered recently, likely dates back to 1846, the museum said.
The Smithsonian Institution purchased the daguerreotype for $456,000 (£356,000) at a Sotheby's auction in June.
The portrait is "one of exceedingly few surviving photographs of the woman who has defined for two centuries what it means to be the First Lady of the United States of America", Sotheby's said in a statement.