A village shaped from its hillside

Trôo—often written without the circumflex in databases, but pronounced “Tro”—does not sit against a hill so much as unfold through it. Terraces, narrow lanes, steps, caves and rock-cut homes climb above the Loir valley in the Vendômois, in central France. The commune is small: INSEE counted 309 residents across the municipality in 2023. Yet a walk through the village moves between open views of the valley and rooms cut into the local tuffeau limestone, an arrangement that makes everyday geography part of the visit.

The name is commonly connected with the French word “trou” (“hole”), an explanation repeated by local visitor sources, but it should be treated as a proposed etymology rather than a settled fact. The caves themselves have many uses and histories: some were homes, others cellars, workshops, storage spaces or passages. The village is not simply a collection of picturesque caves. Its steep topography shaped defense, worship, work and shelter, while the softer limestone made excavation possible.

Medieval defenses and a layered religious centre

The most dependable historical story begins with Trôo’s strategic position over the Loir. The municipal heritage account places the first fortified enclosure and the foundation of the Collegiate Church of Saint-Martin around 1050, under Geoffroy Martel, count of Anjou and Vendôme. It describes a second defensive line in the twelfth century, protecting newer dwellings and the priory of Notre-Dame-des-Marchais. The surviving earthwork, known as the motte castrale, rises above the valley; the town gives its dimensions as roughly 50 metres across and 14 metres high. From its top, visitors can read the relationship between plateau, hillside and river plain.

Trôo later stood in the contested borderlands between the French crown and the Plantagenet territories. The municipal chronology records an attack by Philip Augustus in 1188 and the burning of part of the lower settlement. It also describes later damage, the dismantling of fortifications under Henri IV in the late sixteenth century, and the dissolution of the collegiate chapter during the Napoleonic period. These events help explain why the present village combines substantial medieval remains with gaps and later rebuilding. The older story that Trôo was a Roman oppidum and the repeated claim that thousands lived here in the Middle Ages need stronger archaeological or documentary support; neither is needed to appreciate the securely documented medieval town.

Saint-Martin is the principal architectural anchor. The municipality dates its foundation to the eleventh century and describes later additions to the vaults, transept and choir. The church was altered over centuries, and its current form preserves that history rather than representing one untouched period. The nearby Sainte-Catherine leprosarium, also known as the Hôtel-Dieu, is attributed to Geoffroy Plantagenet in the twelfth century; its remains are protected, and the site is not an ordinary interior visit. The old walls, gates and the route toward Notre-Dame-des-Marchais can be read as parts of a larger religious and defensive landscape.

Caves that tell stories of work and shelter

Several visits make the troglodytic character tangible. The Cave Yuccas is a former six-room dwelling excavated in tuffeau and furnished to evoke domestic life at the beginning of the twentieth century; the municipality says it remained inhabited until 1965. The Cave du Vigneron presents the local winegrowing tradition and seasonal products. In the Grotte pétrifiante, water carrying dissolved limestone leaves mineral deposits over time, forming stalactites and a stone basin; the municipal account calls it more precisely a crystallizing cave. Remains associated with the former chapel of Saint-Gabriel add a devotional layer to the geological visit. Opening times and entry arrangements vary, so check with the local visitor association before arriving.

At the Puits qui parle, a clear echo gives the well its name. The Ministry of Culture records its unusual acoustic quality and its protection as a listed historic monument in 1935. A local story explains the echo through a talkative woman and the Devil; it belongs to village folklore, not documented history. This is a good place to see how Trôo’s physical features generate stories while remaining distinct from the evidence about when and how the well was built.

The village also carries a twentieth-century artistic trace. Antoine Bourdelle designed its First World War memorial after visits encouraged by journalist Auguste Arnault. The municipal record says it was inaugurated in 1923 and bears 25 names. It links Trôo’s landscape to the sculptor’s work and turns a small memorial into an unusually direct encounter with local remembrance.

A living village of craft, food and visits

Tourism matters, but it is only one part of local activity. The municipality’s economic directory lists a glass bead and jewellery workshop with demonstrations, contemporary marquetry and bookbinding ateliers, a local winegrower, a seasonal wine museum, food production and a participatory grocery. Food and lodging are available in the village, although the range is modest and hours are seasonal. These are small businesses and associations rather than a large visitor infrastructure; checking opening days or booking ahead is part of planning a good visit.

Local associations organize guided walks and manage several visitor sites. A standard guided circuit can connect the collegiate church, motte, walls, the echoing well, troglodytic lanes, Cave Yuccas and the crystallizing cave. The terrain is steep and the routes include numerous steps and uneven passages; wear shoes with good grip and allow time to climb at a comfortable pace. Visitors with limited mobility should ask in advance which sections and interiors can be accessed.

Getting there and exploring the Loir valley

Vendôme is the nearest major gateway, about 25 kilometres away according to the heritage-village network. Its TER station and Vendôme–Villiers TGV station connect the area with regional and Paris rail services; the final leg to Trôo needs an onward road or local transport connection. Check MOVE Vendômois or the regional JV Malin planner for the exact date and stop, rather than assuming that a bus runs directly to every visitor site. In summer, the Train Touristique de la Vallée du Loir operates a special return journey between Thoré-la-Rochette and Trôo on selected dates. It is a seasonal excursion, not a daily rail service, and reservations are required.

Trôo also fits naturally into a slower route through the Vendômois. The Loir Valley cycling itinerary connects Montoire-sur-le-Loir with Trôo and other riverside settlements; nearby Lavardin and Thoré-la-Rochette add castle, village and wine-country stops. Give Trôo at least half a day if you want to climb the old lanes, enter a cave museum and take in the view from the motte. The village’s strongest impression comes from that sequence: limestone underfoot, cool rooms inside the hill, and the Loir valley opening below.

Useful visitor links