The American Southwest is considered one of the most impressive and iconic landscapes of the world. Everyone knows the towering sandstone formations of Monument Valley - it belongs to our collective memory of fascinating sceneries. Much fewer people know, however, the world that lies beneath the surface. The "World of the Slot Canyons". These deep narrow canyons are a magical wonderland of erosion. Buckskin Gulch is the longest in the world. You can walk through for days and lose yourself in its beauty.