The latest issue of the English Heritage magazine arrived earlier in the week. There was an article about Grimes Graves and when I saw the picture of a flat landscape full of hollows, it immediately recalled the book Company of Liars. There is a sequence towards the end of the book with a very similar landscape.

The hollows were very close to 'The Hermitage' which is marked on the map in the front of the book. This seems to be very close to the site of Grimes Graves, so it looks like it provided inspiration for the location.