Construction workers in Kyoto’s central Kawaramachi shopping district have unearthed a huge earthenware pot which was found to contain more than 40,000 coins dating right back to the 15th century. All of the coins were tied together in bundles of 97 by holes drilled through the center of each individual coin. During the Muromachi period of 1338-1573, which is when the coins are believed to be from, it was customary to count a bundle of 97 coins as 100. Rough estimations put the value of the coins at around 4 million yen, or $39,400, in today’s value.
These centuries-old coins are not only in fantastic shape, but there's an abundance of them, allowing scientists to study as many as they like, all while leaving enough to be exhibited. The chest was probably the life savings of a samurai, buried due to the wars and assassinations going on in 15th century Japan and then, obviously, never retrieved.