The stronghold dates to the 13th century, when the Baucay family, lords of Loudun, built the original fortification known as Motte Baucay. Its position in the contested borderlands of western France made it a prize during the Hundred Years' War, when English forces seized the castle repeatedly. The French Revolution brought further devastation. By the early 19th century the battered medieval fortress had changed hands several times, purchased in 1809 by Francois Hennecart, a wealthy businessman, and then sold to Baron Joseph Lejeune in 1857. It was Lejeune's son, Baron Edgard Lejeune, who transformed the castle in the 1870s from a rugged medieval ruin into an extravagant neo-Gothic residence, adorned with turrets, ornamental facades, and lush gardens designed to host the high society of the Belle Epoque.

In March 1932, Baron Lejeune had just installed central heating. The system malfunctioned and a fire tore through the castle with devastating speed. Rare tapestries, centuries of accumulated paintings, and an entire library fed the flames. When dawn broke, the main structure was a hollow shell. Only the chapel, a few outbuildings, and the dovecote survived. The baron lacked the resources to rebuild. Without a roof, rain and frost began their slow work on the exposed walls, and the surrounding forest seized the opportunity. Roots split stone floors. Branches pushed through empty window arches. Within a generation, the chateau had become something between ruin and ecosystem, a place where architecture and nature had reached a strange, beautiful equilibrium.

For decades the ruin attracted only photographers and urban explorers, drawn by its haunting beauty. Then in December 2017, a French startup called Dartagnans organized a crowdfunding campaign with a simple proposition: anyone willing to contribute at least 50 euros could become a co-owner of the chateau. The response was staggering. Within weeks, 27,190 people from 115 countries had contributed, raising 1.6 million euros to purchase the property. By 2021, over 27,900 investors had joined, pushing the total past two million euros. The model was unprecedented: a genuine castle, collectively owned by tens of thousands of ordinary people scattered across the globe, united by a shared desire to save a place most of them had never visited.

The question facing the co-owners was unusual: how much of the ruin should be restored, and how much of the nature that had claimed it should remain? The castle's fame rested precisely on its state of romantic decay, the trees growing from roofless halls, the green mantle of vegetation draped over crumbling walls. French photographer Roman Veillon had featured it in his book Green Urbex: Le monde sans nous, celebrating the way abandoned spaces are transformed when humans leave. A complete restoration would erase the very quality that had made people care enough to save it. The ongoing work focuses on stabilizing the structure against further collapse, making select areas safe for visitors, and preserving the interplay between medieval stone and living forest that makes the Mothe-Chandeniers unlike any other castle in France.