When Martin Backhouse started tuning the piano he knew something was wrong. From "the first octave," he could tell something inside the instrument was affecting the sound, but he never expected what he would find.
The piano had been donated to England's Castle Community College by a local couple, but they had no idea what was hiding inside: 900 solid gold coins worth $640,000.
It's not the first time treasure has been discovered hiding in plain sight, but the value of the coins sets this stash apart from other antiques.
The discovery has brought a decades-old mystery to light, but also started a debate about who should keep the treasure.
In the 1980s, Meg and Graham Hemmings bought a used piano from their friends. They had a house full of young children, and the instrument was used - and tuned - often for the next 20 years.
When it was time for the couple to downsize, they donated the piano to a local community college. The piano still worked with the coins inside, so no one realized they were there.
That is, until Backhouse realized something was "off" with the sound. Because of a British law, Backhouse and the college will get a cut of the treasure's sale, but the Hemmings won't.
Click the next page to learn the mystery behind these coins!