Earl Charles Spencer , 61, enjoys sharing fascinating information about his ancestral seat, Althorp House , and his 296,000 Instagram followers lap it up. Growing up, he lived there with his sister, Princess Diana , and to this day her legacy lives on at the property with a temple dedicated to her in the grounds and her burial site on an island in the middle of the Oval Lake .

On Thursday, Charles revealed a lesser-known fact about the property, revealing how they protect all of the precious books in their picture-perfect library. The historical pieces are kept safe with UV proof glass and blinds, Diana's brother told his following.

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Alongside a series of photos of the much-loved reading room, he penned: "I'm working in the Library at @althorphouse today,

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