Gatehouse at Fort Williamsburg

The Gatehouse at Fort Williamsburg is a Grade II* listed building designed in the style of a Neo-classical garden pavilion. It faces the former parade ground and is constructed of red brick, which is now covered in cement render. The building features a hipped slate roof with bracketed eaves, which extends over a lean-to rear entrance made of rubble. The symmetrical front has a central two-order arch, flanked by smaller blind arched recesses beneath a deep bandcourse at impost level, adorned with paterae ornament and plaster roundels above. The recesses include viewing slits. At the opposite end, there is an arched entrance and an attached footbridge that crosses the ditch.

The fort itself is roughly square in shape, with redans at each of the four corners, surrounded by ditches and revetment walls. Inside, a central path is flagged with slate and flanked by a cobbled floor that features a geometric pattern of medallions, hearts, and flowers. The later part of the building consists of a single chamber, which includes additional viewing apertures that lead to a rear section that tunnels into the bank.