[1] The general course of Hadrian's Wall passes under the village of Walton, and Milecastle 56 is wholly obliterated.

[3] It has never been located on the ground and its approximate position has been calculated from neighbouring structures on Hadrian's Wall.

[3] Nearby is a Roman altar built into an outbuilding of Sandysike farm, 0.7 metres above ground level.

[3] Turret 56B (Cambeck) (grid reference NY51236394) is situated about 140 metres east of the Cam Beck on a river terrace.

[5] The site of the Roman fort at Castlesteads (Camboglanna) is situated 440 metres south of Turret 56B.