The Boneywell at Richard's Castle first seems to have been mentioned (other than in the Wonder List, if it is) in Camden's Britannia (1607)1. However, it was a popular spot in the 1700s and 1800s for a bit of sketching, and lovely sketches of it exist. Examples are linked below:

Etching by R.W.Evans

Etching by John Wood, 1823

Sketch by Bernard Lens, 1722