A forgotten 17th-century portrait sat in a Maine attic for decades; estimated at $15,000, the mystery painting eventually sold for $1.41 million. The painting, titled Portrait of a Girl, was found during an estate visit in Camden, Maine. A label linked it to Rembrandt. The artwork was sold to an unnamed European collector, but experts have not authenticated it as a Rembrandt painting. One expert estimates its value could reach $15 million if confirmed.