Pentre Ifan....

This photo has been in our home for several years.
It was a gift.
On its back someone has written these words:

Pentre Ifan (5000 years old)
August, 1990

I thought that my friend Robert Welch was the photographer.
When I asked him to send me the story, he said he hadn't been to Wales in 1990.
So this is a mystery photo.
If you have a story about Pentre Ifan, share it with us.
This picture needs a story.