Wales has some very interesting geosites, here are jsut a few of my favourites

Cwm Idwal, which is both a glacial cwm and a syncline in mid-Ordovician rocks – here is the Devil’s Kitch or Twll Ddu, the axis of the syncline

This image is one of the pillow lavas formed in a back arc spreading basin

Nant Ffrancon

Nant Peris