These 190km labyrinthine caves, 35 minutes from Schwyz in Muotatal, are Europe's longest and the world's fourth-biggest. You’ll need a guide, sturdy footwear and warm clothing to explore them. Trekking Team arranges everything from short tours to overnight bivouac expeditions that include the surreal, 'only-in-Switzerland' experience of a fondue feast in the inky cavern darkness.
