The Worst Hill in Wales

That's the one down into Nant Gwyrtheyn  and the Welsh Language Centre on the site of the old Quarry that used to provide Granite setts for road making.
This is the official site
http://nantgwrtheyrn.org/days-out/

And here is the sad legend of a Young couple  who lived there

The first two images are taken from the same spot, about a third of the way down the hill and the last image is the view from the car of a relatively lever bit just after the hairpin bend where the other photos were taken, in all the hill is about 900 feet high!
The story of Rhys and Meinir