Giggleswick Scar is a series of long, cavern-filled limestone cliffs that run along the route of the old A65. The natural curiosity Wordsworth mentions (the well) intrigued tour writers from the eighteenth century forward. An underground syphon seems to be the most likely explanation for the rise and fall of the water, which is less frequent and dramatic now than it was in Wordsworth’s time. The well may still be seen at the side of the road at the base of the cliffs. (Photo by kind courtesy of and may not be used elsewhere without the express permission of the copyright owner.)