Harvard learned it has an authentic Magna Carta. In 1946, it paid less than $28 for it

A copy of the 1300 version of the Magna Carta on display at the Harvard Law School.

A pair of U.K. scholars discovered the mislabled document in Harvard Law School's digital archives. The university bought it for just $27.50 in 1946. It turned out to be an authentic copy dating to 1300.

(Image credit: Lorin Granger)