There is a wooden bench and a stone barbeque set there.
I don't know if this can be added to the map. The wooden bench, probably.

Check routing at this junction

57 Cae Chwarel, Llanllechid. Mary Jones merch fy hen daid Richard Jones /Dickie Gamin

Power pole is marked on the wrong side of the road.

via StreetComplete 62.1

Attached photo(s):
https://streetcomplete.app/p/322000.jpg

way/941427764/history has so = residential

What is the meaning of this unusual key? Is this tag needed?
Or maybe can it be expressed in a more typical way that would be easier to understand?
Or maybe this key can and should be documented as useful tagging schema?

Do we have a source for calling this "the secret waterfall"?

Doing an internet search for "The Secret Waterfall, Wales" give a different location https://explorestronger.co.uk/secret-waterfall-hike-in-snowdonia-wales/
Other one is in the Brecon Beacons.

One site does refer to
"Blaenau Ffestiniog's hidden waterfall walk"
But that is to the east of Festiniog.
https://www.loveouradventures.com/post/rhaeadr-cymerau-coed-cymerau-isaf-blaenau-ffestiniog

Pottery