Switzerland Trummelbach Falls

Ever been to a waterfall and it's been so loud you haven't been able to talk without shouting?  Then try a waterfall on the inside of a cliff face soon after heavy rain.

Trummelbach falls ate away the surface to get where it is today.  And the Swiss ate more of it away to build a lift and make a network of steps and paths so we could get to it and see it inside the rock!  We were lucky seeing it in all its glory the day after heavy rain.