Pontremoli—described by Emperor Frederick II as the "key and door of the Apennines"—is dominated by its castle. The Castle of Piagnaro, built around the year 1000, was strategically positioned to control the many roads crossing the surrounding mountain passes, including the Via Francigena.
The name of the castle derives from the sandstone slabs, known as piagne, traditionally used for roofing in local architecture. The fortification, built on two levels, reveals multiple historical layers: the oldest core includes a majestic keep, while the later section dates back to the 16th century.
Now fully restored, the castle has housed the Museum of the Stele Statues since 1975, playing a vital role in preserving and promoting the cultural identity of Lunigiana.
