Constructed in 1675 by the Knights of the Order of St. John, Notre Dame Gate serves as the main entrance to Cottonera. Among the seven gates along the 9 km defensive line surrounding the Three Cities, this gate stands towers over the other buildings in the Cottonera region with its six levels. It features four expansive bombproof barrack rooms, a spacious terrace, and an imposing gatehouse that once housed lifting machinery for the portcullis gate. The baroque architectural style reflects the era of its construction. Adorning the facade are a bronze bust of Grandmaster Cotoner and a sizable marble inscription commemorating his patronage and the construction of the Cottonera Lines.