Barclodiad y Gawres is one of the most impressive of the many prehistoric remains on the Isle of Anglesey. This Neolithic chambered tomb has been partially reconstructed, which helps a great deal to give an idea of the site and how it was used.
Bodowyr is a Neolithic burial chamber, or passage grave. The chamber consists of three large upright stones with a capstone on top, and the interior is reached by a short passageway at the east end. Easy, signed access in a farm field makes this one of the most visited prehistoric sites on Anglesey. B4419, Llangaffo, Gwynedd, Wales
Fifteen stones survive in this cairn circle. The stones, up to 6 feet tall, spread out from the centre of the cairn like a porcupine's bristles. Access is via a 4 mile walk through marshy ground, so be sure to bring good footwear! Talsarnau, Gwynedd, Wales
Bryn Celli Ddu is a very well-preserved megalithic mound tomb, one of the finest in Britain. The earthwork mound was once surrounded by a stone circle, which seems to have been destroyed in the construction of the tomb. Llanfair PG, Anglesey, Gwynedd, Wales
Two large stones are all that remain of this large circle that must originally have sported 8 stones in a ring of 40 feet in diameter. These are among the tallest standing stones in Wales, with one at 13 feet in height and the other measuring about 10 feet.
The name Caer Leb translates loosely as Leaven Castle. That might conjure up images of battlements and drawbridges, but nothing could be further from the truth. This 'castle' is a prehistoric enclosure near the River Braint. The site is bounded by an arrangement of double banks and ditches, some sections of which have since been levelled. Brynsiencyn, Anglesey, Gwynedd, Wales
A Neolithic burial chamber, built sometime around 2000 BCE. There are two false entrances, but the real tomb is entered from the south, where an inner passage leads to a cross passage leading to two circular burial chambers located on an east/west axis. Capel Garmon, Gwynedd, Wales
One of a number of prehistoric sites in the fields near Brynsiencyn village, Castell Bryn Gwyn is a fortified enclosure, probably erected in the Neolithic period, though it appears to have been used throughout the Iron Age and the Roman period. Brynsiencyn, Isle of Anglesey, Gwynedd, Wales
Five low stones in a circle that has been called the smallest in Britain. Quartz deposits have been unearthed in a pit in the centre of the circle. Circle 275 is quite close to the more striking Druid's Circle. Penmaenmawr, Gwynedd, Wales