He Built a Dome-Roofed Round Stone Cabin — Held Heat Like an Oven at 50 Below All Winter

In 1902, Antoine Roamora began building a house in Idaho that his neighbors thought looked more like a stone tomb.

It had no corners.

No wooden roof.

And almost no windows.

Instead, the French stonemason built a circular cabin with walls nearly 30 inches thick, then slowly curved the stone inward until the walls closed into a dome.

People laughed.

Even county inspector Whitfield Chastain ordered him to stop, warning that the strange roof could collapse.

Antoine kept building.

He had grown up in Provence, where generations of masons built thick stone shelters that survived extreme weather.

His first Idaho winter had nearly broken his family. Their ordinary log cabin leaked cold through every crack. They burned wood constantly, yet water still froze indoors.

Antoine realized the problem was not the fire.

It was the house.

So he built differently.

The thick limestone walls absorbed enormous amounts of heat. A small central fire warmed the stone slowly, while the curved dome captured rising heat instead of letting it escape through a thin roof.

At the very top, Antoine left a small opening that allowed smoke to escape.

By winter, the strange cabin was finished.

Then temperatures plunged far below zero.

Across the Boise Basin, families crowded around roaring stoves. Frost covered walls. Firewood disappeared rapidly.

Inside Antoine’s stone dome, the first days were cold as the massive walls absorbed heat.

Then something changed.

The stone became warm.

Once heated, it released that warmth slowly back into the room.

Soon Antoine needed only a small fire.

His children played without coats.

His wife could work comfortably.

The entire circular room stayed evenly warm because there were no frozen corners and almost no drafts.

Whitfield Chastain discovered this during the worst cold spell.

His horse lost a shoe near Antoine’s property, forcing him to approach the strange stone structure.

Then he heard something unexpected from inside.

Children laughing.

He knocked.

When the door opened, warm air washed over his frozen face.

Antoine’s family sat peacefully inside while the world outside remained brutally cold.

Chastain stared at the curved stone walls.

“The stone holds the heat,” Antoine explained. “The fire warms the stone. Then the stone warms us.”

The inspector who had once condemned the building quietly withdrew his citation.

Soon other families came to see it.

Several began constructing similar stone shelters.

Antoine had not invented anything new.

He had simply carried an old idea from Provence into Idaho.

His neighbors built roofs to keep winter out.

Antoine built his entire house like an oven—and taught the stone to keep the fire long after the flames had faded.