The Lauterbrunnen Valley's most famous of its 72 waterfalls.

Trummelbach Falls, the most unique and powerful of the valley’s 72 waterfalls. Unlike a typical waterfall that cascades out in the open for all to see, Trummelbach is a subterranean watefall that flows inside the mountain. Trummelbach Falls single handedly drains the entire glacial melt of the Eiger, Monch, and Jungfrau, at a rate of 20,000 liters per second. For 11 francs, visitors can take an elevator up inside the mountain to the uppermost falls for views of it tumbling through the narrow slot canyon.