What is the fine-grained topic of the following text: In the 1984 ‘rockumentary’ film ‘This Is Spinal Tap’ the band who star in the film use a mini-prop version of Stonehenge on stage – and now Tufnel has made some drastic claims about the historic site’s origins. Only return the topic.
Claims about Stonehenge's origins in the film 'This Is Spinal Tap'