Forte di Monte Ercole, Military fort in Gemona del Friuli, Italy.

Forte di Monte Ercole is a mountain fortification in Gemona del Friuli positioned at 305 meters elevation, built with military defense in mind. The site contains underground tunnels, firing positions, and cannon emplacements that remain visible throughout the structure.

Construction took place between 1904 and 1913 to create a defensive position against the Austro-Hungarian Empire in the region. The fort was abandoned in 1917 during the Battle of Caporetto, marking the end of its military usefulness.

The fort's name comes from the hill it stands on, Monte Ercole, above the village of Ospedaletto. In military plans it was first called "Opera del Monte Comielli", and work began on 8 October 1904 with a request sent to Gemona's municipality for data on water-supply properties. Near the village centre, remains of Napoleonic-era fieldworks from the 1809 fighting are still visible.

The path to the fort departs from Via Priorato and takes approximately two hours of walking, so wear sturdy shoes for the hike. A light source is essential when exploring the underground tunnels and enclosed passages throughout the site.

The fort was part of the "Upper Tagliamento" barrier group, alongside Monte Festa, Chiusaforte and Osoppo. Of the roughly 48 works built along Italy's borders between 1904 and 1913, 44 stood on the frontier with Austria-Hungary. The Ospedaletto complex was meant to shell the Venzone narrows, hitting the Pontebbana road and railway.