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Wonders of the Isle of Anglesey

Llanddwyn Lighthouse, Anglesey
Llanddwyn Lighthouse, Anglesey / Richard Banton, Flickr / CC BY 2.0

WorldBlue  Highlights

The most amazing wonders of Anglesey are:

  • Archaeological heritage – island and nearby smaller islands are very rich with diverse archaeological monuments, including several stones with amazing prehistoric carvings.
  • Early medieval architecture – there are several interesting structures, which were built already around the 3rd – 6th century AD, as well as interesting buildings from later medieval times, including the high achievement of British defensive architecture – Beaumaris Castle.

Map with the described wonders

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WorldViolet Top 25 wonders of the Isle of Anglesey

Geological wonders

Bwa Gwyn and Bwa Du

Beautiful natural arches above the sea.

Ogof Badrig (Patrick’s Cave)

Seaside cave below the Llanbadrig Church. Site of legends – reportedly St Patrick found a refuge here after the shipwreck.

Natural tunnel in Penmon

A few meters high arch – tunnel under the cliff near the sea.

Biological wonders

Beech in Plas Newydd

Largest beech (Fagus sylvatica) in Britain. Girth of this tree is 9.62 m, height – 26 m.

Archaeological wonders

Holyhead Mountain

A prehistoric village site with remains of some 50 buildings. Village covered 6 – 8 ha, in use from 500 BC to some time after the end of Roman governance. In some hut circles have been found examples of stone furniture.

Bryn Celli Ddu

Site of a stone circle and burial mound with passage grave. The stone circle and henge were built in the Neolithic period. Stones were removed in Bronze Age when a passage grave was built. In the burial chamber was located a carved stone with a twisting, serpentine design. Now there is a replica standing outside. The passage is oriented towards the summer solstice.

Bryn Celli Ddu, Anglesey
Trefignath Chambered Tomb

Large, impressive chambered tomb. First part built around 3000 BC, supplemented several centuries later.

Din Lligwy

Village site of Roman – early British times with well preserved, circular stone bases of huts with outer walls.

Barclodiad y Gawres

Neolithic burial chamber on the coast. Notable features of this cruciform passage grave are decorated stones that are adorned with spiral marks, chevrons, wavy lines, and other motives. Reroofed with concrete.

Barclodiad y Gawres, chevron marks in chamber
Lligwy Burial chamber

A surprising megalithic monument – a circle of upright stones with giant, 25 tons heavy slab on top. Here were found remains of some 15 – 30 people and late Neolithic pottery.

Cytiau Tŷ Mawr

Prehistoric hut circles in Holyhead Island – ring-shaped groundworks from Iron Age. These huts were in use up to the 6th century AD.

Llwydiarth Esgob Stone

Stone with intricate carvings – grooves, cupules, cup and ring marks.

Bodowyr passage grave

Neolithic passage grave. A dolmen with three upright stones covered with a capstone.

Architecture wonders

Beaumaris Castle

Impressive, well-preserved castle, built during the English conquest of Wales. Construction started in 1295. A masterpiece of military architecture.

Beaumaris Castle, Anglesey
Plas Newydd

Country house, the seat of Marquess of Anglesey. The current house was built in the 18th century in Neo-Classical and Neo-Gothic styles. House contains the largest painting of Rex Whistler. Reported haunting by the Old Maids.

Plas Newydd, Anglesey
Tudor Rose in Beaumaris

One of the oldest preserved timber framed buildings in Britain, built in the 14th century.

Church of St Cwyfan on Cribinau (the church in the sea)

A small island with a church that was built in the 13th century. Church still is used.

Church of St Cwyfan on Cribinau, Anglesey
Menai Suspension Bridge

One of the first modern suspension bridges in the world. Designed by Thomas Telford, built in 1819 – 1826. Length of the whole bridge – 417 m, the longest span is 176 m. Deck is 30 m above the water.

Tal-y-Llyn St Mary’s Church

Small medieval church, oldest parts might be preserved since the 12th century. Church is almost unchanged.

Britannia Bridge

One of two historical bridges linking Anglesey Island to the mainland. The original bridge was designed by Robert Stephenson and was a tubular bridge of wrought iron. In 1972 it was rebuilt as a beautiful two-tier arch bridge. Total length – 461 m, longest span – 140 m, rises 40 m above the water.

Penmon Priory (St. Seiriol’s monastery)

Old monastery, established in the 6th century AD. The oldest parts of the church building are from 1140. Inside the church are two ornate stone crosses from the 10th century.

St. Seiriol’s Well

Holy well with a built structure over it. Lower part of stone walls of this structure are built in the 6th century AD.

Llynnon Mill

The only historical windmill in Anglesey. Built in 1775, renovated and open to the public.

Melin y Bont

A unique mill, powered by wind and water. Built in 1825.

Castell Aberlleiniog

Ruins of a motte and bailey fortress, built between 1080 and 1090. Originally here was a timber structure but before the middle of the 17th century it was replaced with stone structure.

WorldYellow Recommended books

Anglesey: A Megalithic Journey


The extraordinary wealth of ancient and historical sites on the Welsh island of Anglesey represents a microcosm of British history, from the deep Neolithic past to the Roman occupation, through the rise of the Welsh princes to the heyday of the Victorian resort of Beaumaris. It was on Anglesey that the ancient Druids took their last stand against the Roman invaders. Neil McDonald is an expert on the mythic and historical geography of Anglesey. In this fascinating book, he explores the island’s heritage and countryside, providing vivid descriptions and rich historical backgrounds for its landmarks and culture.

Anglesey Hidden Gem


Anglesey Hidden Gem – The world is bigger, more interesting, and much more profound when you can attach a name and a story to a place. With that thought in mind, I welcome you to my fully illustrated book about Anglesey, My Hidden Gem. This is very much my book, my stories – amusing, eccentric, and quirky – because it’s all about My journeys and My island home. Allow me to share and guide you.


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