Salt Island, Anglesey

Admiralty Arch, in Holyhead, Anglesey, was built in 1824 to mark the end of Thomas Telford's Holyhead road. The arch was designed by Thomas Harrison and its main purpose was to commemorate the visit of King George IV of the United Kingdom in August 1821. The King arrived in Holyhead on the royal yacht Royal George on the 7 August, continuing to Plas Newydd where he stopped overnight. He returned the next day to his yacht, but due to poor weather his departure was delayed and the decision was made to transfer to the steam packet Lightning which conveyed him on the 12 August to Howth, near Dublin for his state visit to Ireland. The change to the packet boat was met with widespread approval.Funded through public subscription the structure took two years to complete and was made of stone quarried at Red Wharf Bay on the eastern side of Anglesey. Due to its history it is known alternatively as the George IV Arch by the Royal Commission on the Ancient and Historical Monuments of Wales or the Triumphal Arch. The Grade II* listed arch is situated within the Port of Holyhead on Ynys Halen and cannot be accessed by the public due to safety reasons. In 2017, plans to move it to a more open location were mooted. At present the best place from which to view it is from St Cybi's Churchyard.At the seaward end of the Admiralty Pier, beyond the arch, is the Grade II listed Holyhead Mail Pier Lighthouse, completed in 1821 it was designed by John Rennie as part of extensive improvements to Holyhead Harbour.

Holyhead Mail Pier or Admiralty Pier Lighthouse on Salt Island, Anglesey, is an inactive lighthouse which was designed by the civil engineer John Rennie in 1821. It was built in the early 19th century to help guide shipping into the newly constructed harbour, now known as the Port of Holyhead, which acted as the terminus for the packet service between England and Ireland. It is probably the second oldest lighthouse in Wales, after Point of Ayr Lighthouse and is the last of a series of three lighthouses located on Salt Island.

The Port of Holyhead (Welsh: Porthladd Caergybi) is a commercial and ferry port in Anglesey, Wales, handling more than 2 million passengers each year. It covers an area of 240 hectares, and is operated by Stena Line Ports Ltd. The port is the principal link for crossings from north Wales and central and northern England to Ireland. The port is partly on Holy Island and partly on Salt Island (Welsh: Ynys Halen). It is made up of the Inner Harbour, the Outer Harbour and the New Harbour (opened in 1880), all sheltered by the Holyhead Breakwater which, at 2.7 kilometres, is the longest in the UK.

Stanley Sailors' Hospital (Welsh: Ysbyty Morwyr Stanley) was a health facility in Holyhead, Anglesey, Wales.

Holyhead Town Hall (Welsh: Neuadd y Dref Caergybi) is a municipal structure in Newry Street, Holyhead, Wales. The town hall is the meeting place of Holyhead Town Council.

Eglwys y Bedd ("Church of the grave") (sometimes referred to as Llan y Gwyddel, or "Church of the Irishman") is all that remains of a 14th-century church in Anglesey, north Wales. It is set within the churchyard of St Cybi's, Holyhead, and may have been built on the site where Cybi (a 6th-century Celtic saint who settled in Holyhead) lived and ministered. It is reputed to house the grave of Seregri, an Irish warrior who lived in the area in the 5th century. It is a Grade II listed building, a national designation given to "buildings of special interest, which warrant every effort being made to preserve them". It housed the first school in Holyhead in the 18th century and is now used by St Cybi's church.

The Celtic Gateway (Welsh: Porth Celtaidd) is a stainless steel pedestrian and cycle bridge located in Anglesey, Wales. Opened on 19 October 2006 by Andrew Davies AM to better connect Holyhead's railway station and ferry terminal with the town centre for pedestrians and cyclists. The distance between the two was originally 830 metres, including two steep inclines and the crossing of a busy road. A 1991 bridge reduced the distance to 585 metres with one steep incline but with the road crossing still needed. The current bridge has one shallow incline and cuts the distance to 280 metres with no roads to cross. Crossing the Old Holyhead Harbour, the North Wales coastal railway line and the A5154 (formerly the end of the A5), this 160-metre-long (520 ft), 7-metre-wide (23 ft) structure was built in the futuristic architectural style by the Italian company Cimolai. The whole length of the bridge is wheelchair and pram accessible. The Gateway is further enhanced by a number of artworks. These include: "Sun boats", a series of bronze plaques which have been built into the bridge paving. The sun boat image is derived from the sun-worshipping Celts who believed it travelled across the night sky in a boat; 'Porth Celtaidd - Celtic Gateway' a series of Venetian Glass mosaic by artist Gary Drostle.

Caer Gybi was a small fortlet in Roman Wales in the Roman province of Britannia Superior. Its name in Latin is unknown. Today it stands at the centre of Holyhead in the Welsh county of Anglesey. Holyhead is named Caergybi in Welsh, after the fort. The fort is one of Europe's only three-walled Roman forts. The fourth side fronted the sea and was probably the site of a quay. Its date is unknown, but it is generally thought to be part of a late-4th-century scheme, associated with Segontium, which was used to defend the west coast against Irish sea-raiders. The Romans also built a watch tower, within Mynydd y Twr on the top of Holyhead Mountain, which was almost certainly used as the fort's look-out point. Both were possibly abandoned around 393, when the troops were sent to respond to the revolt of Eugenius of Gaul. In the 6th century, the old fort was given to Saint Cybi, who founded a monastery there. The Church of St Cybi still stands on the site today, with a small detached chapel (Eglwys y Bedd) that reputedly stands over Cybi's grave.

St Cybi's Church is a medieval church near the Roman Caer Gybi in Holyhead, Anglesey, Wales. The church was Grade I listed in January 1968. The original church was constructed at Holyhead around 540 AD by St Cybi, a cousin of St David. The church was sacked by Viking invaders in the 10th century and damaged again in 1405 by Henry IV's invading force. The present church was built in the 13th century and stands near the Roman fort in Holyhead.

Holyhead Market Hall, located in Holyhead, Anglesey, Wales, is a Grade II listed building built in 1855. It was commissioned by the local landowner and politician William Owen Stanley and built by J. Edwards Thomas. As well as housing the town's market it has historically been used as a law court, a military barracks, a mechanics' library and a boxing/wrestling venue. Located on the site of the old market cross and accessed from Stanley Street, the town's main throughfare, it was changed and improved in 1906. It is a two-storey building measuring 1,732 square metres and is built of local green shaley rubble with buff sandstone dressings and slate roofing. After 145 years of use the hall temporarily closed its doors, then became a furniture store and, fittingly, a grocery store. The building was listed in 1992, "for its importance to Holyhead and as a prominent mid C19 town centre building with a well preserved facade."After it stood empty for 15 years, becoming one of the most "dilapidated civic buildings in Wales," the Isle of Anglesey County Council gained control of the building via a compulsory purchase order. The council then restored it with funding from the National Assembly for Wales and the National Lottery Heritage Fund. Opening in September 2019, the building now houses the town's library as well as meeting rooms available to rent by local interest groups and businesses. In 2020 the project won a Royal Institution of Chartered Surveyors Social Impact Award, with judges from the Institution stating: "The revitalising of Holyhead Market Hall has not only conserved a landmark building in Holyhead, but has also provided a much need[ed] social facility with a diverse range of activities. The remodelling of the building in a way that also retains and presents the archaeology and historic features of the building is impressive."

Holyhead railway station (Welsh: Gorsaf reilffordd Caergybi) serves the Welsh town of Holyhead (Welsh: Caergybi) on Holy Island, Anglesey. The station is the western terminus of the North Wales Coast Line 105+1⁄2 miles (170 km) west of Crewe and is managed by Transport for Wales Rail. It connects with the Port of Holyhead ferry terminal. The station is connected to the town centre by a stainless steel pedestrian/cycle bridge named The Celtic Gateway (Welsh: Porth Celtaidd).

Holyhead Breakwater is situated at the north-western end of Holyhead in Anglesey in North Wales. The Victorian structure, which is 1.7 miles (2.7 km) long, is the longest breakwater in the United Kingdom. The breakwater, which is accessible in good weather, has a promenade on top which leads out to the Holyhead Breakwater Lighthouse.