Carreg Coetan

Living where I do, it's no big deal to visit a prehistoric tomb on the way to the dentist - the one's across the road from the other.
The little Pembrokeshire town of Newport, or Trefdaeth in Welsh, has grown up around the river estuary which, many thousands of years earlier, was chosen as a burial site for some unknown individual or family.
The vertical stones formed the burial chamber with the huge capstone placed, or dragged, or levered, to rest on top. The whole structure would then have been covered with earth but how the site would have been treated subsequently we can only surmise - perhaps the mound was regarded with awe and reverence, perhaps it was the spot to celebrate seasonal festivals or to gather before attacking a neighbouring clan. As time passed and memory faded it might have become a trysting place for lovers or a playground for children.
In the 18th and 19th centuries local antiquaries broke into these tombs and discovered... very little, to be honest, perhaps just an earthenware pot containing scorched bone fragments.
Modern archaeologists consider that the orientation of these sites with regard to geographical features such as rivers and hilltops was likely to have been highly significant: what could be seen from it, and from where it was visible? This one, regardless of the houses and gardens that now surround it, remains close to where the river meets the sea, and with a clear view up to the ancient volcanic peak of Carn Ingli mountain.

(It was a dull day so I added a little saturation to compensate for the poor light.)