A fine extensive pier is now completed, on an island called _Ynys-halen_, which forms the north side of the harbour; at the extremity of which is a fine light-house, exhibiting a brilliant light by oil gas. This grand national undertaking has already afforded an asylum to the trade of the Channel: no less than sixty or eighty vessels have entered the harbour in one day, and many more have sailed out in one tide. Before the erection of the pier, which commenced in 1809, many valuable vessels, seeking for shelter in stormy weather, were lost with their crews on the southern shores of the harbour. From this port are sent upwards of 40,000 bushels of excellent grain every year. It contains 4071 inhabitants. Under the mountain which overhangs the town, called the Head, is a large cavern, supported by natural huge pillars, named the Parliament House: this, as well as several others, perforate deep into the mountain, and is inaccessible without a boat. The South Slack light-house, on an islet, within about twenty yards of the bold cliffs of the mountain, exhibits a revolving light of the greatest utility. The islet is connected with the mountain by means of a suspension bridge, which is worthy the attention of the curious. Among these rocks vast numbers of the peregrine falcon take, up their abode, together with pigeons, gulls, puffins, razor-bills, and other sea-birds. In returning from Holyhead, instead of taking the old circuitous line of road by Gwyndee and Llangefni, we took the new road, formed by Mr. Telford under the direction of the parliamentary commissioners, and which cost government, exclusive of bridges and embankments, at the rate of 2000_l._ per mile. The steepest part of the present line does not exceed one in thirty, and is considered the finest specimen of road-making in the kingdom, and at the same time reduces the distance from Holyhead to Bangor full three miles. Having again reached Bangor, we determined still farther to explore the beauties of this delightful spot and its vicinity. Having taken a hasty refreshment, we bent our steps towards Aber cegin, near the mouth of a small rivulet that empties itself into Port Penrhyn, and from thence proceeded to PENRHYN CASTLE, the mansion of George Hay Dawkins Pennant, Esq. which is delightfully situated on a wooded eminence, between the estuaries of the Cegin and the Ogwen, about two miles east of the city of Bangor. It commands a fine view of the bay and town of Beaumaris to the north; the great Ormes Head, and Penmaen-mawr terminate the prospect on the east; and towards the south, the scene is closed by a bold and romantic range of mountains. A short distance west of the Castle is Port Penrhyn, where the slates are brought down from Mr. Pennant’s quarry, and shipped in immense quantities to various parts of the world. It is easy of access, perfectly sheltered, and capable of accommodating trading vessels of upwards of 300 tons burthen.