Imagine this at the end of your Garden

And it is running under a little bridge to a house off the Portmadog to Blaenau Festiniog road. 
It's beautiful and surprisingly noisy too, but I imagine that the people in the house are completely used to it by now and would only notice if it stopped flowing, but what a thing to see when leaving your house!
And there are several more like this further up the mountain too!