Conservatoire de l'agriculture-Le Compa, Agricultural museum in Mainvilliers, France.

Conservatoire de l'agriculture-Le Compa is an agricultural museum in Mainvilliers that displays farming equipment and rural technology. The building shows how people in earlier times worked the land and brought in their harvests.

In 1977 the SEDIMA trade association launched a national agricultural machinery museum, and in 1981 Chartres beat Niort to host it. From 1985 the Eure-et-Loir departmental council acquired the former SNCF steam locomotive repair roundhouse, built in 1905, and its metal structure and large glass bays were kept during an 18-month conversion begun in 1989. Culture minister Jack Lang and agriculture minister Henri Nallet inaugurated the museum on 17 July 1990; it became the Conservatoire de l'agriculture in 1995 and a Musée de France in 2002.

The museum shows how farming and rural life transformed over generations and what these changes meant for people. You can see how techniques and tools shaped daily work and fundamentally changed how farmers operated.

The museum welcomes visitors on specific weekdays and weekends and is easy to reach by car or public transport. It is worth checking beforehand when it is open and whether guided tours are available.

The garden on the esplanade Martial-Taugourdeau is laid out as an "abécédaire eurélien": 26 letters from A to Z along a boustrophedon path of 261.5 m, a length matching the labyrinth of Chartres Cathedral. The museum also holds the first American tractors of 1910-1912 (Case, Sawyer Massey), of which no other examples survive in Europe.