At a glance
A 5,000-year-old Neolithic passage tomb on Anglesey — free open access, chamber you can enter, and a passage aligned so the midsummer solstice sunrise illuminates the burial chamber. One of the finest prehistoric monuments in Wales. Free (Cadw), LL61 6EQ.
About Bryn Celli Ddu
Bryn Celli Ddu — "the mound in the dark grove" — is a Neolithic passage tomb built approximately 5,000 years ago (c.3000 BC) in the agricultural heartland of Anglesey. It is one of the best-preserved prehistoric monuments in Wales and one of the finest examples of a passage tomb in Britain — a corbelled stone chamber reached by a narrow passage, covered by a circular mound of earth and stone.
The monument was built on the site of an even earlier ritual enclosure — a henge comprising a circular ditch, bank and standing stones. The Neolithic builders partially dismantled this older monument to construct their passage tomb, incorporating one of the henge stones into the new structure. The site therefore represents at least two phases of prehistoric ritual use spanning many centuries.
The chamber's passage is aligned with deliberate precision so that at the summer solstice (around 21 June), the rising sun shines along the passage and illuminates the back of the chamber. This astronomical alignment — demanding considerable planning and astronomical knowledge — demonstrates that the monument's function was tied to the solar calendar. Similar solstice alignments are found at Newgrange in Ireland (built c.3200 BC) and, in a different form, at Stonehenge. The comparison gives a sense of the intellectual and organisational capacity of these Neolithic communities.
During excavations in the 1920s and 1930s, archaeologists found a remarkable carved monolith (the "Pattern Stone") within the mound — its abstract spiral and geometric patterns have no parallels elsewhere in Wales. The original is in the National Museum Wales in Cardiff; a replica stands inside the chamber.
Visiting Bryn Celli Ddu
- The passage and chamber — Enter the low passage (stooping required) and stand inside the corbelled chamber — bring a torch. The replica Pattern Stone is inside.
- The mound exterior — Walk around the circular mound — observe the ditch and the relationship between the entrance facade and the surrounding landscape.
- The solstice event — Cadw organises supervised solstice dawn visits every June — book well in advance via cadw.gov.wales.
- The field walk — The 500-metre path from the car park crosses typical Anglesey farmland — good for a short walk and views to the Menai Strait.
Find it on the map
Frequently asked questions
Bryn Celli Ddu was built approximately 5,000 years ago — around 3000 BC, during the Neolithic period. This predates Stonehenge by several centuries. It was built on the site of an earlier henge monument (a circular ditch and bank with standing stones), which was partially dismantled to construct the passage tomb. The site had therefore been used for ritual purposes for an even longer period before the present tomb was built.
The passage at Bryn Celli Ddu is aligned so that at the summer solstice (around 21 June), the light of the rising sun shines directly along the passage and illuminates the back of the burial chamber. This deliberate astronomical alignment — requiring considerable knowledge and precision from its Neolithic builders — indicates that the tomb had a ceremonial function tied to the solar calendar. Cadw organises supervised dawn visits at the solstice; book well in advance as they are very popular.
Yes — visitors can enter the passage and stand inside the burial chamber. The entrance passage is low (you will need to stoop considerably) and the chamber is small but standing-height inside. Inside, a replica of the "Pattern Stone" — an elaborately carved monolith found within the mound during excavation — is displayed (the original is in the National Museum Wales, Cardiff). A torch is useful as the chamber interior is dark.
Bryn Celli Ddu is in the agricultural centre of Anglesey, near the village of Llanddaniel Fab, postcode LL61 6EQ. From the A4080 near Llanfairpwll, turn onto the B4408 and follow brown tourist signs. A small free car park serves the site. The tomb is a 500-metre walk across a field path from the car park — level ground, passable in ordinary shoes. There is no public transport to the site — a taxi from Llanfairpwll station (3 miles) is the practical alternative.
Bryn Celli Ddu means "the mound in the dark grove" in Welsh — bryn (mound/hill), celli (grove/copse) and ddu (dark/black). The name suggests the site was associated with a wooded area in historical memory. Today the tomb stands in open farmland with no trees, but the name preserves a reference to the landscape as it existed — or was remembered — in medieval times.
Yes — at no cost and with free open access, it is one of the best-value prehistoric monuments in Wales. The combination of an intact burial chamber you can actually enter, the dramatic midsummer solstice alignment, and the peaceful Anglesey farmland setting makes it genuinely moving. It pairs very well with Plas Newydd (3 miles), making a full morning or afternoon on the Menai Strait shore of Anglesey.