La Porte Monumentale

Built in molasse, its ironwork and grooves under the vault prove the existence of a portcullis and a wooden door. A coat of arms of the Princes of Monaco is hammered on the tympanum of the vault. A guardroom is located on the first floor.

The centerpiece of a complex of which only the porch remains, it was built on a Gallo-Roman foundation. The corbelling at the top is more recent.
On the outside, this doorway had a four-sided roof. The layout of the fittings and the grooves in the stone show that this gate was once defended by a portcullis. The arms of the Princes of Monaco were carved on the town's three existing gates.