The Trümmelbach Falls are not to be missed. A short funicular railway built inside the mountain takes you halfway up the cliff-side, and from there a path disappears into a series of caves past four waterfalls, down which the melt waters from the Eiger, Mönch and Jungfrau rush at a rate of up to 20,000 litres per second.
The name "Trümmelbach" comes from "Trommelbach" meaning a stream that sounds like a drum, and the sounds are almost as impressive as sights.
On returning to the top of the lift there is a path leading down the side of the mountains past a further series of six open-air waterfalls, every bit as spectacular as the ones inside the caves.
Note: The names are mine. Officially the waterfalls only have numbers.