From Pont-y-pridd we made another excursion toward Merthyr-tidvill; less to witness the lately-acquired importance of the town in consequence of the great iron-works established in its neighbourhood, than to trace the beauties of the Taffe through its romantic valley. At one time, a towering hill completely mantled with wood lifted its shaggy summit to the clouds; in succession, naked rocks perpendicularly descended to the water; or, through favoured hollows, a stripe of green meadow would gently slope and mix its verdure with the stream. As we advanced, the narrow valley still further contracted, and the river, confined by the approaching bases of the mountains, assumed the character of a torrent. Our road continued on one margin of the river, and a canal, singularly abounding with locks, kept pace with us on the other; to the Cyclopean region of Merthyr-tidvill. {173} We did not enter the town, but re-measured our steps to Pont-y-pridd; and about four miles below it bade adieu to the romantic course of the Taffe, in deviating up a steep confine of its valley towards the town and castle of Caerphilly. [Picture: Caerphilly Castle] The celebrated ruin of CAERPHILLY CASTLE soon appeared at some distance beneath us, occupying the centre of a small plain, which, with its surrounding amphitheatre of hills, presented a display of regular fences and cultivation that strikingly contrasted with the district that we had just left. The idea formed on a first view of this stupendous pile is rather that of a ruined town than a castle: it is by much the largest ruin in Britain, although its dimensions are somewhat inferior to those of Windsor castle. The high outer rampart, with its massive abutments and frequent towers, still in a great measure entire, conveys at once a clear impression of the great extent of the fortress. In entering upon an examination of the ruin we passed the barbican, {174} now built up into habitations; and, proceeding between two dilapidated towers, entered the great area of the castle:—a range of building, beneath the rampart on our right, once formed the barracks of the garrison. We then advanced to that pile of superior building, _i.e._ of citadel, hall, chapel, state and other apartments, which is generally considered as the castle, in distinction from the encircling area and its wall: clambering over the fragments of another drawbridge and its defending towers, we entered the first court, which appears to have comprised the citadel: thence we passed through a large gateway, with several grooves for portcullises, to the principal court of the Castle. The area of this court is seventy yards by forty: on the south side is that princely apartment, by some considered the hall, and by others the chapel: but, whichever it may have been, vestiges of much original beauty appear in the elegant outline of its four large windows; the grand proportions of the chimney-piece, and