Monte Cero, Mountain summit in Euganean Hills, Italy

Monte Cero is a mountain in the Euganean Hills that reaches about 400 meters in elevation with distinctive rock formations throughout its slopes. A trachyte quarry operates on the southern side near the village of Calaone, where extraction continues today.

This mountain formed millions of years ago when volcanic activity shaped the entire Euganean Hills region, giving them their distinctive dome-like appearance. The volcanic origins remain visible in the rock types and internal structures today.

Monte Cero rises above Calaone, a frazione of Baone, with Este about 3.5 km to the south. The summit carries the repeater antennas that make the hill easy to recognise from the neighbouring Euganean Hills. The name Cero is shared with the mountain itself and appears on maps of the Colli Euganei.

Multiple marked trails lead to the summit, with the main route beginning at Calaone village and offering clear signage throughout. The climb is moderate and straightforward, making the hike accessible to most visitors.

The trachyte rock contains rare crystal formations including cristobalite crystals with distinctive pyramidal shapes and hexagonal lamellar quartz. These mineral curiosities make the stone particularly interesting to geology enthusiasts and collectors.