http://discovermagazine.com/2008/feb/the-m...of-silbury-hill

Silbury Hill, a 4,400-year-old, 130-foot-high mound of chalk and dirt about 80 miles west of London, has finally yielded its ancient secrets. It is not the tomb of the long-forgotten King Sil nor the resting place of a golden knight. And it is not, despite the folklore, a dumping ground for the devil’s dirt, forced to drop there by the magic of priests. The story behind the mysterious hill is much less colorful. Silbury Hill is a shrine filled with rocks that, for Stone Age Britons, probably represented the spirits of ancient ancestors.

i vote for excavation

All throughout the world these mounds are being discovered.
In ancient cultures - 'rocks' - (or as mentioned in the Bible scriptures) - pillars of stone or wood - were carved as representations of the gods.
These rocks are also called 'standing stones.' And are related to something called - Asherah/Asherim.

Obadiah 1:3

"The arrogance of your heart has deceived you, You who live in the clefts of the rock, In the loftiness of your dwelling place, Who say in your heart, 'Who will bring me down to earth?


The Rock that Whispers
New evidence of the earliest known ritual behaviour
Text: Paul Devereux / Images: Dr Shiela Coulson, University of Oslo, Norway

April 2007
rock that whispers
The python-head rock in the Tsodilo Hills, Botswana

Evidence for possibly the earliest known ritual activity has been uncovered in Ngamiland, Botswana. Archæologists investigating the Tsodilo Hills there found a secluded cave, the “Rhino Cave”, next to a rock resembling a python’s head. Hundreds of man-made indentations peppered the rock, known to the San (Bushmen) as the “Rock that Whispers”.

A test pit dug in front of the python simulacrum revealed many stones that had been used to make the indentations. Together with these tools, some of which were over 70,000 years old, more than 13,000 artefacts were unearthed, including burnt spearheads and possible ritual articles. The rock’s natural pythonesque appearance had been enhanced by human carving and grinding – the python is a key figure in San mythology.

Lead archæologist Sheila Coulson also found a secret chamber behind the python rock. Parts of the entrance to this small chamber were worn smooth, indicating extensive usage over the ages. “The shaman could have kept himself hidden in that secret chamber,” Coulson suggested. “When he spoke from his hiding place, it could have seemed as if the voice came from the snake [rock] itself.”