This castle, once the residence of the famous Sir Rhys ap Thomas, I imagine, was intended more for a noble residence than a place of defence. The walls of this building are very thick, and constructed with stones of a large size, strongly cemented with mortar. It is situated on a branch of Milford Haven, and consists of a range of apartments built round a quadrangle, with a circular tower at each corner. The south wall is entirely demolished; but the north consists of a spacious hall, measuring one hundred and two feet by twenty, supposed to have been built by Sir John Perrot: above and under this hall are noble apartments and extensive offices. This castle appears to have been erected at different times, if we may judge from the architecture. Every ledge of the walls of the towers, denoting the different stories, was embossed with vegetation, which seemed to grow from the solid stone. Over the gate-way, at the west side, are the arms of England, Duke of Lancaster, and Carew; and contiguous to this entrance is another spacious room, measuring eighty feet by thirty. The village of Carew is poor: there is, by the side of the road, a cross, fashioned out of a single stone, fourteen feet high, and carved all over. Leaving Carew, we crossed a small bridge over an arm of Milford Haven, and continued our route across a barren and uninteresting heath; till, descending to the village of CRESSELEY, the luxuriant plantation of firs, belonging to Sir William Hamilton, attracted our attention. Small vessels constantly frequent this quay, from whence a quantity of small coal is shipped to different parts. From hence the road is extremely barren and unpicturesque; but, about three miles from LANDSHIPPING, an arm of Milford Haven again burst upon our sight. Near it is situated the uninhabited house of Sir William Owen. In crossing the ferry, Picton Castle, the property of Lord Milford, formed a prominent feature in the gay scene; and Slebitch, the seat of Mr. Philips, standing at the end of the Haven, contributes considerably to this picturesque prospect. The grounds of PICTON, through which we passed, about five miles in extent, seemed to be well planned, and kept in excellent order. This castle has always been inhabited; and, having escaped the fate of all other castles in Wales, during the civil wars, it retained, till very late, much of its original external form.