Read it through once

Part of the ground we came over was not ground at all, but rocks--cream-colored rocks, worn smooth, as if by water; with seldom an edge or a corner on them, but scooped out, honey-combed, bored out with eye-holes, and thus wrought into all manner of quaint shapes, among which the uncouth imitation of skulls was frequent. Over this part of the route were occasional remains of an old Roman road like the Appian Way, whose paving-stones still clung to their places with Roman tenacity.