My first stop in Anglesey, a beautiful example of Neolithic burial grounds. On the longest day of the year, sunlight flows into the passageway of Bryn Celli Ddu Burial Chamber. I was there a week before the solstice and already there was plenty of light to see the mysterious pillar stone inside.

The presence of the pillar within the burial chamber, the reproduction of the ‘Pattern Stone’ carved with sinuous serpentine designs, and the fact that the site was once a henge with a stone circle and may have been used to plot the date of the summer solstice, have all attracted much interest.

In the neighbouring field stands Tyddyn-Bach Standing Stone, stunningly held by its shadow tree, a self-seeded elm that has grown directly in line with it. IT is one of the prettiest standing stones I’ve seen, watching over the passage grave some 450m to the north-west.

To visit, there is a car park nearby (53.20483838126782, -4.2399920827644335). I did a sort of circular walk to see them both, though I’ve been advised there are now private property signs on the land where the standing stone stands.