4. The Magna Carta – $21.3 million
Literally translating to ‘The Great Charter’, the Magna Carta is one of the most crucial documents in history. Why, you ask? Because this was the first time when a document was drawn up to guarantee that every citizen of a country is subject to the same laws – whether you’re rich, poor, or even a king!
The book assured everyone of the same rights and the right to seek justice as well. So when billionaire David Rubenstein found out rumors that one of the original copies were being auctioned off to foreign buyers, he intervened and bought it for $21.3 million to keep it in the US.