The Fungo di Piana Crixia — the mushroom of Piana Crixia — is one of Liguria's most striking natural features. A cap of harder sandstone perches on a tapering column of softer marl, the whole formation rising about ten metres above the surrounding ground. Protected since 1971 as a regional nature monument, it sits inside a small natural reserve on the edge of the village.
The reserve is easy to reach on foot from the village centre, following a short path through mixed woodland of oak, chestnut, and broom. There is nothing else quite like it in the region: geologists call the formation a hoodoo or earth pillar, but this one is unusually large and well-preserved. The area around it is peaceful and largely unvisited — you are unlikely to share the path with more than a few other walkers.