Monumento naturale regionale di Preia Buia, Natural monument in Sesto Calende, Italy.
The Preia Buia monument consists of three erratic boulders made of serpentine rock, located in a wooded area near San Vincenzo Oratory.
The site dates back to the Quaternary Era, specifically to the last glaciation of the Neozoic period, and contains prehistoric petroglyphs carved into the rocks.
The main boulder features numerous symbolic engravings and cup marks, suggesting its past use as an altar for prehistoric ceremonies and rituals.
The monument is managed by the Natural Park of Ticino Valley consortium, which maintains the site and provides digital information through Italian parks portals.
The serpentine boulder exhibits magnetic properties that interfere with compass readings, while its green-tinted rock formation originates from a different geographical area.
Location: Sesto Calende
Inception: May 22, 1984
Part of: Natural Park of the Ticino Valley in Lombardy
GPS coordinates: 45.73608,8.62738
Latest update: March 10, 2025 22:21
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