That picture of the hydro tunnel (top pic) on that wiki page is taken from the top of the small castle tower that allegedly held Llewellyn the Great, the last (Welsh) Price of wales, apparently he was betrayed by his brother to the English.
Also in that water is an evolution of Arctic Char, that can only be found there, demonisation even though way inland it was once connected to the sea.
Also the seam of slate that the quarry was built on travels all the way to canada.
If anyone is ever in Llanberis, there is a great climbers cafe called Petes Eats, great place and cheap. They have open map rooms above, outlining all the cloning and walking routes.
It also where you can get the ridiculously priced Snowden express.
Back to the hydro tunnel mentioned above, and il pictured on the wiki, each Xmas they have a grotto deep inside, and a small narrow gage train takes you down to see Santa.
Llanberis is a nice day out all round. The slate museum is free to,and is an afternoons entertainment in itself.
Talking of reperposed mines local to the area they have converted a network in to an underground play area for kids with huge cavernous drops under the course and trampolines. It’s impressive. Also a couple of ex Marines in the next valley have set up the longest zip line in the uk (maybe world) which has grown into a decent business too.
Bounce below
https://www.roughguides.com/article/a-giant-underground-trampoline-has-opened-in-a-cave-in-wales/
Zip world
https://www.zipworld.co.uk
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