Ouvrage Saint-Roch, Military museum in Sospel, France.

Ouvrage Saint-Roch is a Maginot Line artillery work southwest of Sospel, at 426 m on the right bank of the Bévéra. Its entry block (Block 1) sits in a narrow valley, while Block 4, the massive artillery blockhouse, borders the D 2204 road to the Col de Braus. The blocks are strung along one line, with the usine and barracks behind, and the concrete is capped by a small domed cupola.

Built between November 1930 and June 1932 by contractors Marting and Roussel, Ouvrage Saint-Roch cost 12.7 million francs, of which 2,128,000 francs went to armament. It formed part of the Alpine Line, the Maginot Line's southeastern extension, in the Sospel sub-sector. With its neighbour Agaisen it was meant to block the Sospel gap, the route from the Col de Tende to Nice. It saw no direct fighting in June 1940.

The site is run by the Association de l'Armée des Alpes, which opens the ouvrage and an associated museum year-round. Visitors walk the 60 cm narrow-gauge gallery where hand-pushed SE wagons carried shells of 80 to 105 kg, and see the underground barracks, filter rooms and telephone exchange that sustained the garrison.

Visitors should expect moderate physical exertion, as access involves stairs and narrow passages carved into the rock. It is advisable to wear comfortable shoes and be prepared for cool, damp conditions inside.

Block 4, the artillery block, was designed with extra-thick concrete to withstand rockfalls from the mountain above, not only enemy fire. Its armament included a 75 mm gun aimed along the axis of the Grazian tunnel exit to block the Sospel–Breil railway line.