Another two of the Seven Wonders of Wales listed are Mount Snowdon and Pistyll Rhaeadr.
Mount Sowdon is literally just a mountain, no one built it or anything, it just happens to be there. At a whopping 3,560 feet tall, it's the highest peak in Wales. Pistyll Rhaeadr is a waterfall, again just a natural feature that happens to exist in Wales.
Yet another is the Overton yew trees, apparently a long time ago someone put some seeds into a patch of soil. Seriously, that's it.
Apparently they could only find four things that were actually created by Welshmen to be proud of, and one of those is a set of fucking church bells.