The profile of Edinburgh was born of a marriage between nature's sculpture and man's architecture. The epicentre is Castle Rock - a volcanic plug - which constantly draws the eye from all parts of the city. Sloping down from it is a jagged outline of impossibly high medieval tenements lining the Royal Mile, which is punctuated at the foot of the tail of glacial debris by Holyrood Palace. That Edinburgh is beautiful is not in doubt. It is a city blended...