Coming through Wales on the A5 towards Anglesey you will pass Llyn Ogwen (which is a great place to stop and take a quick stroll up some mountains or look at some lakes). Under the bridge which crosses Afon Ogwen you can actually see the remains of a much older bridge spanning the waterfall. Again it was not the best weather but the the slate of the bridge and the rocks with the lichen - they just have something I like.