When any work seems to have required immense force and labor to affect it, the idea is grand. Stonehenge, neither for disposition nor ornament, has anything admirable; but those huge rude masses of stone, set on end, and piled each on other, turn the mind on the immense force necessary for such a work. Nay, the rudeness of the work increases this cause of grandeur, as it excludes the idea of art and contrivance; for dexterity produces another sort of effect, which is different enough from this.
Part II Section XII. - A Philosophical Enquiry into the Origin of Our Ideas of the Sublime and Beautiful (1757)