The monument includes the remains of Holy Rood parish church set in a walled graveyard in Old Town, Swindon. The church stands isolated on a level hilltop within the grounds of The Lawn, a former mansion belonging to the Goddard family, and now public parkland. The surviving above ground remains of the church include the chancel, now used as a chapel, and three pairs of piers which flank the nave. One complete arch survives on each side of the nave, the flooring of which also survives. The remainder of the church survives as below ground remains only. Early references to the church suggest that it existed in 1154 although no trace of this structure remains above ground. In the 13th century a chancel was built and a small chapel was attached to the north side of this. The church was remodelled during the 14th century, with the addition of the clerestory, and in the 15th century when the south doorway was constructed from two shaped stones. The north doorway also survives and forms the present entrance to the chapel. Most of the parish church was demolished in 1852 but the original chancel, which formed the east end of the church, today survives as the Chapel of Unity. The Goddard family vault stands on the site of the north chapel. The remains of the church are Listed Grade II. The graveyard, now closed, is bounded by a wall, constructed during the 18th century of rubble limestone with stone coping and topped with wrought iron railings. The ground slopes down towards the south west and the wall here has been strengthened with five large buttresses at some time before 1810. The wall, which is Listed Grade II and is excluded from the scheduling. All footpaths and the chapel, which continues in use, are excluded from the scheduling, although the ground beneath these features is included.