The Devil's Column (Colonna del Diavolo)
A severed Roman column outside a medieval basilica, with two holes locals say were punched in by the Devil's horns.
Just outside the Romanesque Basilica di Sant'Ambrogio, one of Milano's oldest churches, stands a lone Roman-era marble column with two clearly visible holes near its top. According to local legend, the Devil himself left them there, furious after failing to tempt St. Ambrose — he charged at the saint, missed, and drove his horns straight into the stone instead.
The story doesn't stop at the legend: locals say that if you press your ear to the holes, you can hear the faint sounds of Hell, and catch a whiff of sulfur. Whether or not you're brave enough to try, the column itself is a genuine Roman relic, likely repurposed from an earlier building, standing in the same spot for centuries.
It sits directly in the piazza in front of the basilica, visible to anyone who walks past — most people just don't know to look for it.
Why it's a secret
It's easy to mistake for a random leftover architectural fragment rather than a specific, storied monument, so most visitors to the basilica never realize what they're looking at.
How to get there
It stands in Piazza Sant'Ambrogio, directly outside the Basilica di Sant'Ambrogio. Nearest station: Sant'Ambrogio (M2, green line).