A guided exploration of the 19th-century gallery at Terme di Porretta, overlooking the sulfur thermal springs. The tour is conducted in Italian.

In 1884, a tunnel was carved into the rock to channel waters from the Porretta Vecchia spring and connect two existing thermal facilities. Approximately 120 meters long and nearly straight, the tunnel is predominantly lined with masonry, featuring exposed rock at the vault's center and stone walls. During construction, several water seepages and a new spring, Porretta Nuova—still active today—were discovered.

The gallery emerges near the Madonna del Ponte sanctuary and can be visited, accompanied by a guide and equipped with helmets, offering an up-close view of the sources of Terme di Porretta's precious waters. Restoration and redevelopment works on the gallery were completed in June 2022.

Minimum age: 6 years old. Duration: approximately 2 hours (including an explanatory tour of the thermal establishment and its therapeutic areas). Rubber-soled shoes required. Reservation required. Start time: 10:00 am.