The Nilsson family found the hefty gravestone tucked in under the floor. It measured almost two metres in length and was some 10 centimetres thick.
"I was quite surprised. And my wife is still getting over the shock," Gert Nilsson told The Local. "It's the last thing I could imagine finding under my floorboards."
Nilsson explained that his house is "a pretty old one" and that the floors are directly on the ground, but added that despite 27 years in the house he's never seen anything like it.
The family looked up the three names engraved on the headstone and found they belonged to people who'd likely owned the property in Fuglie, southern Sweden, in the late 1800s. The stone had the names of two men and one woman who died in 1843, 1851, and 1884 respectively.
The homeowners, however, now have a new problem on their hands.
"They must have chucked it out when they renovated the church," he told the paper last spring.