Ramparts of Senlis

The Ramparts of Senlis are Gallo-Roman city walls built in the 3rd century to defend Augustomagus against Alemanni and Frankish invasions. The wall stretches 800 metres and originally featured 30 towers, of which 16 survive today. Constructed using the Roman technique of alternating stones and bricks, the fortification enclosed a castrum of approximately 6 hectares. It is one of the rare constructions of this type preserved in near-entirety in France, with walls reaching 7 to 8 metres high and varying from 2.3 to 4 metres thick.