Castle dykes it is a small class one henge, 90m across, perched on the high ground up in the North Yorkshire dales. The bank survives up to 1.5 m high in places, and the ditch up to 3 m deep. Early 20th-century reports (1908) noted its intact form, and recent LiDAR-based surveys have confirmed its classic henge profile with minimal later disturbance.
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Moulton Henge
Archaeologists now recognise a true Neolithic henge lying immediately south-west of Moulton village, roughly midway between the Swale and Dere Street. The monument is almost 200 m across, with a low earthen bank encircling an inner ditch and a central platform about 110 m wide; the ditch lies inside the bank—the classic “Class II” henge arrangement.

