Top 13 Amazing Discoveries That Took Us by Surprise!

7. Action Comics #1 Found Hidden in Wall

Where: Minnesota, USA Year Found: 2010s Estimated Value: $176,00* When individuals renovate their homes, especially if they were built decades ago, it's astonishing what they find. During renovations at his Minnesota home, David Gonzales came across Action Comics #1, the first issue of the DC comics that featured Superman.

Action Comics #1: Hidden in a Wall @Pinterest/USAToday The comic books published by the rival Marvel company, Action Comics, were some of its most profitable, and collectors of comic books today find it difficult to locate the original issues. Gonzales' copy was in better shape than many others, and he eventually sold it for around $200,000. Unbelievably, the comic book and a variety of other materials were used as insulation for the walls by the previous owners, who built the house in 1938.

8. Piano Tuner Discovers Gold Sovereign Coins Inside Piano

Location: England's Shrewsbury Year Found: 2017 Value Estimate: $4000-$600,000* Bishops Castle Community College sent an antique piano to be serviced by a tuner. When the tuner disassembled it, he found what was subsequently referred to as the biggest British gold coin hoard ever found. The previous owner of the gold had stashed the coins inside the piano and never came back to get them.

Piano Playing With Gold Coins @TheSunOnline/Twitter.com The discovery was deemed "treasure" by the Shrewsbury Coroner's Court, allowing the college and tuner to divide the profits. The 913 gold sovereigns, which were dated between 1847 and 1915, were valued between $400,000 and $600,000. Despite the fact that fifty people came forward to claim the treasure as their own, John Ellery, the county coroner, disregarded all of them and declared the identity of the genuine owner to be "unknown."