Tinkinswood - or, portal to the Faerie realm? ;)
Tinkinswood Burial Chamber is what this is commonly referred to. But it has other names - it is as old as the other dolmen burial site I shared earlier. 6,000 years BP (before present). This one is just as off the beaten track but it had teensy car park at least right in front of where you walk to it - through someone's fields :)
It was absolutely empty and we never saw another soul. This dolmen structure is what St. Lythans would have looked like if it was more complete - but this one is bigger. It would have been completely covered in soil like a barrow mound - but the structure is different and so they call them dolmens instead. The large stone on top is a record breaking size - it is considered the largest dolmen capstone in Europe.
Legend has it that anyone who spends a night at Tinkinswood on the evenings before Beltane, Midsummer or Samhain - or the Three Spirit Nights, would either die, go mad, or become a poet. I am honestly surprised that there aren't more stories about a place like this.