The epitome of prehistoric Cwmdeuddwr, perhaps?
Image credit: Robert Gladstone
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That's a great photo of the site. I don't know this part of the world and just starting to map out a few sites around the area for a first foray, so many to choose from.
Cwmdeuddwr is a great, extended area to seek out stuff you're more or less guaranteed to have to yourself. That this one isn't even on the map say it all.
Pumlumon's been dismissed by people not willing to explore and get off the beaten track - by those who have no idea what they're talking about, in other words - so another place to just go walkabout.