Harry Shearer (as Derek Smalls), Christopher Guest (as Nigel Tufnel) and Michael McKean (as David St. Hubbins) in 'This Is Spinal Tap'

The Best In Show director claims he knows the name of the man responsible for the construction of the mythical Wiltshire site as part of a hilarious new National Geographic Channel chat.

Guest pretends to be his Spinal Tap alter-ego, Nigel Tufnel, throughout the skit, which can be found online at StonehengeDecoded.com.

Spinal Tap are forever connected with Stonehenge because the mock rockers attempted to recreate the famous stone circle onstage in cult movie This Is Spinal Tap.

The Internet chat promotes new National Geographic Channel show Stonehenge Decoded, which debuts on 1 June (08).

Source: WENN