Masso Gastaldi, Glacial erratic in Pianezza, Piedmont, Italy.
Masso Gastaldi is a large glacial boulder that rises dozens of meters above the surrounding landscape, creating a striking natural landmark. The rock is topped with a chapel, and inside its structure lies an underground chamber that has been carved into the stone.
The boulder was transported by glacial movement during the Mindel glaciation period through the Susa Valley to reach its current location. Over time, the site evolved to serve religious purposes and later was adapted for military use.
A chapel at the summit is dedicated to Archangel Michael, reflecting the spiritual connection this place has held for local people over centuries. The rock has always been seen as a sacred location by the community.
The site is open to visitors but is maintained by a local mountaineering organization, so it is best to check ahead for current access conditions. Plan your visit for clear weather when pathways are dry and safe to navigate.
Hidden within the rock is a World War II air raid shelter that was carefully restored and opened to the public in recent years. This underground space shows how the stone formation has served as refuge for people across different periods of history.
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