Its Lauterbrunnen Valley, which stretches south from the city of Interlaken, is a wonderful springboard for some of my favorite Swiss Alp experiences. Lauterbrunnen Valley, with its vertical sides and flat bottom, is U-shaped — a textbook example of a glacier-shaped valley. While the main town, also called Lauterbrunnen, sits on the valley floor, neighboring towns hang on cliffs high above. And perched on a saddle between two of those mountains is the Jungfraujoch station — and that's where we're going…by train. The Jungfraujoch [station] is like a small resort perched on a mountain ridge.