The Shrine of Hercules Curinus is a Roman-era sanctuary cut into the slopes of Monte Morrone, about 4 km from Sulmona on the way up to the hermitage of Sant'Onofrio. The visible remains include a large terraced platform, the foundations of the cella, and a vaulted substructure — the Italic-Roman engineering still impressive after two thousand years.
The site is open-air and free. The footpath from the Badia Morronese passes through it, so it makes a natural addition to a half-day visit combining the abbey, the shrine, and the hermitage. The views down across the Peligna Valley are excellent, and the spring wildflowers on the surrounding slopes are some of the best in Abruzzo.