Photos: Treasure Trove of Unopened 17th-Century Letters

A trunk containing about 2,600 undelivered letters—600 of them unopened — was recently rediscovered. A team of researchers is now collaborating on a new project to study the rare archive, using X-rays to virtually open the sealed notes. (All images ©Signed, Sealed & Undelivered Team, 2015. Courtesy of the Museum voor Communicatie, The Hague) [Read full story about the initiative to study the sealed letters]

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