Siena raised this ring of walls between 1213 and 1219 to guard its northern frontier against Florence, and the circuit of about 570 meters still runs almost unbroken around the hilltop. Dante compared its towers to the giants standing in the pit of the Inferno. Fourteen square towers stud the perimeter, and two gates, Porta Fiorentina and Porta Romana, still admit visitors into the tiny borgo inside. The south walkway along the ramparts lets you look over the rooftops toward the Chianti hills and the Via Francigena, and on clear days to the towers of San Gimignano. The village is small enough to see in an hour.
The fortification records Siena’s north-eastern frontier strategy toward Florence. Its apparent medieval fabric includes documented later transformations and tower reconstruction, so the circuit, gates, towers, borgo and museum route need separate source-backed relationships.

Sources and citations (2)
- Comune di MonteriggioniStoriaCastle and circuit historyRead source
- SIAS, Archivio di Stato di Siena, Ministero della CulturaComunità di Monteriggioni1214 frontier outpostRead source








