This 1968 dig was not, however, the first attempt to uncover the secrets of Silbury Hill. The Duke of Northumberland sank a shaft into the mound in 1777. A tunnel was dug in 1849, while in 1922 ...

no evidence of burials has been found in Silbury Hill. It is estimated to be the product of some 4 million hours of work and 500,000 tons of material. The mound, which mostly consists of chalk and ...