During my recent Swiss adventures I visted Trümmelbach falls. These falls are unique due being located inside a mountain.
Trümmelbach falls is located in the valley of Lauterbrunnen. Since Lauterbrunnen was J R R Tolkiens inspiration for Rivendell, it would not surprise me if these falls served as the inspiration for the Mines of Moria (tho I have no reason to believe this is true - it just reminded me of Moria).
See what I mean?
The power of the falls is quite intense. Each one would be a tourist draw in and of itself. 10 in a row is quite spectacular. You can sense the power in the falling water, and I visited at a pretty dry time of year where glacier runoff (the source of the falls) was not at peak.
I could also envision Gollum crawling over these rocks.
Some of the stairs were quite long. This one is at least 2 storeys worth of stairs, all at once.
This is the pool at the top of the falls (at least at the top of the tunnel system). It is a long way back from here.