Omphalus stones

111 Cannon Street is the address of the London Stone at the base of the street pyramid in the City of London. This is the stone the Romans laid as the omphalos stone, the point from which all distances were measured in Britainnia.

A Babylonian omphalos stone (from Rawlinson). A flattened view of its
entire conical design is seen in the accompanying illustration http://www.bibliotecapleyades.net/universo/siriusmystery/siriusmystery06.htm

Thebes, Egypt (left), Greek engraving of Delphi (Note: Apollo’s harp, Doves), (right). http://www.ancient-wisdom.co.uk/earthmother.htm