Riding under the gate where the Watling-street enters, I observed immediately two arches of Roman work. I was overjoyed at sight of so noble an antiquity, which has never been mentioned. It was a square of twenty foot within; for so far are they distant from each other, and of so much diameter: they are exactly of the same manner as those at Lincoln; the stones not quite so large, nor so good: the breadth is 2½ foot. On each side was a portal, of a lesser arch, and lower, for foot-passengers; for part of the arch is left, and people now alive remember them open quite through; though now both these, and part of the great arch, are taken up by little paltry shops: or, rather, the lesser ones are quite pulled down, and even the great ones are in the utmost danger of falling; for the occupants of those places cut away part of the bottom of the semicircle to enlarge their shops. The portals answered to the Rows (as they call them) so remarkable in this city, being portico’s quite through on both sides the streets, undoubtedly continued in a manner from the Roman times. It is admirable that these vast arches, made of stones of so large dimensions, and laid without mortar, can stand at all when their proper butment is destroyed: that which regards the city has a key-stone: in both, below the lowest stone of the arch, the two next courses downward project a little inward, in nature of imposts; and over the crown of the arches runs a course of projecting stones moulded a little, but coarsely: the stones are artfully, though rudely cut; to which it is owing that they are not fallen, as depending wholly on their own principles, and the manner of their masonry, or geometry. Here terminates the famous Watling-street, whose beginning in Dover valley I walked over in May last. The road is here preserved, going by the river side to Aldford. The ancient subterraneous canals are perfect still; their outlets into the river under the city-walls are visible; and they say that they are so high, that a man may walk upright their whole length. Wherever they dig, they find subterraneous vaults and arches, and all manner of antiquities; many of which were collected by the late Mr. Prescot, prebend of the cathedral here, and now remain in the hands of his son.