Pietro Micca was a soldier in the Savoy army in the early 18th century, and during the Siege on Turin he became a national hero. There is now a museum dedicated to him in Turin.
In 1706, the French and Spanish armies marched on Turin (then part of the Duchy of Savoy) during the War of Spanish Succession. Pietro Micca's job in the Savoy army involved tunneling in the mines underneath Turin's citadel. In late August of 1706, Micca heard French soldiers making their way up into the mines. He barred his door and exploded two barrels of gunpowder just as the soldiers broke through his barricade, killing most of them. Micca himself was severely injured and died later of his wounds, but by preventing the French from getting into the citadel he helped the Savoy army eventually defeat the French.
The Pietro Micca Museum was opened in 1961 to commemorate Micca's heroic act and the Savoy defeat of the French and Spanish armies, and the building stands over the tunnels in which Micca once worked. Visitors to the museum can descend into the tunnel network.
The Pietro Micca Museum (Museo Civico Pietro Micca a dell'Assedio di Torino del 1706) is located near the Porta Susa train station – it's a short walk from there or the Porta Susa metro stop. The museum is open Tuesday-Sunday from 10am-6pm, and closed Mondays and major holidays. Admission is €3. A museum visit including a 90-minute guided tour of the tunnels is available Tuesday-Saturday at 10:30am, 2:30pm, and 4:30pm, and on Sundays at 10:30am, 2:30pm, 3:30pm, and 4:30pm.