Dating from around 3000 BC, this megalithic passage tomb is the most complete site of its kind in Wales. You enter via a narrow opening built into a burial mound. The passage extends for around 25 feet before opening out into a wider burial chamber. The far wall, made of quartz, is illuminated at dawn on the summer solstice. Bring a flashlight, as the tomb has no artificial lighting. Next to the entrance is a replica of a stone pillar carved with Celtic spirals, found here in 1928. The original is in the National Museum in Cardiff. The site is 7 miles southwest of Beaumaris.
Off A4080, Llanddaniel Fab, LL61 6DQ, Wales