The Heart in the Box Rennes, France. 2014. Conservators opened a sealed lead box. It sat in a 17th-century crypt at the Convent of the Jacobins. Inside was an embalmed human heart. It belonged to knight Toussaint de Perrien. He died in 1649. His widow had it buried beside her own body. 365 years later, it was still intact.
Source
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