In 2013, a contractor bought a crumbling Minnesota home for $10,100, tearing down a wall found a 1938 Superman comic that sold for $175,000

Almost every major renovation uncovers peeling wallpaper, forgotten letters in attic rafters, and yellowed newspaper clippings under floorboards. Occasionally, a block surprises a family with enough money to change their lives overnight, as happened in Elbow Lake, Minnesota, in 2013. A building contractor, David Gonzalez, and his wife bought a crumbling, long-neglected Elbow Lake house for $10,100, beating out a nearby restaurant that wanted to demolish it and turn the land into a parking lot. Gonzalez saw an opportunity to restore the building rather than let it go. It was surprising to him that the walls would make the renovation worth more than the ticket price.Gonzalez and his crew found something unusual in the old newspapers used as wall insulation while gutting the vacant house. A caped man lifted a car above his head on the cover of a comic book worn and faded from decades of pressing inside plaster and timber. That comic was a copy of Action Comics No. 1, which introduced Superman and a new kind of hero. The National Museum of American History notes that Superman's 1938 debut is widely credited with launching what became known as the golden age of comic books, a period that reshaped American popular culture for generations.From attic insulation to auction houseWhen news spread of what had been residing inside the walls of an abandoned Minnesota house for over seventy years, collectors were instantly intrigued. Gonzalez sent the book to an online auction house that has sold some of the biggest comic sales ever. The auction drew 51 bids before closing at $175,000, more than 17 times what Gonzalez had paid for the house.The comic was anything but pristine. Its back cover was torn off in a family squabble shortly after the find, an accident experts say cost Gonzalez tens of thousands of dollars in potential value. Still, the price it sold for showed just how rare and desirable an original copy of Action Comics No. 1 is, among serious collectors, regardless of its physical condition. That condition and what it meant in dollar terms were determined by a professional grading system that most people outside the hobby have never heard of.Why the condition decides almost everythingComic book values are heavily dependent on this grading process, as two copies of the exact same issue can fetch vastly different prices based on how well they held up over the decades. All submitted books are graded by a team of specialists at CGC, the leading third-party grading service in the industry, who award a score out of ten based solely on the book’s physical condition, including factors such as creases, tears, discolouration and missing pieces.Gonzalez's copy was graded a low 1.5 out of ten, due mostly to its damaged cover and its decades folded up inside a wall. A near-mint copy of the same 1938 issue had already gone for more than two million dollars around the same period, illustrating how steep the difference between grades can be. ComicConnect CEO Stephen Fishler said the winning bidder was a serious Golden Age comic collector looking specifically for a lower-grade, unrestored copy of Action Comics No. 1.A gift that kept on givingAfter the first comic was sold, Gonzalez found another Superman comic while continuing work on the house. It too had been hidden in the wall insulation, although its condition was much worse. The second book was in a much worse condition and realised a much smaller sum, but it demonstrated how much forgotten matter may be preserved within a single structure for the better part of a century.Comic Connect claims that in January 2026, another copy of Action Comics No. 1 sold privately for $15 million, setting a new record for the comic, underscoring how a ten-cent pamphlet from Depression-era Cleveland has become one of the most valuable printed things in American history.The windfall never appeared to alter Gonzalez’s worldview all that much. He told the press he wanted to use the money for his children’s education and a donation to a children’s hospital, not a lavish lifestyle. His story endures for renovators and collectors alike, a reminder that the most commonplace-seeming wall may sometimes hide something amazing and that the boundary between demolition rubble and museum-worthy object can be narrower than anybody might expect.Catch the latest World News and Live updates. Download the TOI app.