The Citadel, North Entrance

The Citadel's North Entrance is an entrance to a former military citadel, now a prison, built in 1880, likely designed by Captain E Crossman, Royal Engineers, who was the general designer of The Citadel. The entrance is constructed from Portland ashlar and features a bold elliptical moulded arch set between broad plain abutments that include a plinth and a small recessed gun slit, all topped with a heavy attic course on roll-moulding. The sides of the arch return to the main retaining and abutment walls of The Citadel. Above the arch's crown is a high relief carving of the Royal Arms.

Inside, the moulded arch opens onto a barrel-vaulted section with three cross ribs, leading to a lower segmental moulded arch with a square head and spandrels, which displays "VR 1880" beneath four recessed vertical gun slits. This area leads to a long barrel-vaulted tunnel that ascends to the inner arch, which is semi-circular and features heavily rusticated quoins and voussoirs made of rock-faced squared stone, all under a heavy roll-mould parapet. On the east side, a long flight of plain stone steps descends between ashlar walls to weathered copings, leading down to the roadway from the main Citadel level.