The Wave (Coyote Buttes North)

The Wave is perhaps the most heavily photographed and tightly regulated natural attraction in the American Southwest. Situated in the Coyote Buttes North Special Management Area of the Paria Canyon-Vermilion Cliffs Wilderness, it is a magnificent, surreal basin of swirling, intersecting U-shaped troughs of Navajo sandstone. The rock is fiercely striated with vivid red, orange, yellow, and white banding, formed by Jurassic-era sand dunes compacted over millions of years and then eroded by wind and water. Because the landscape is incredibly fragile, access is strictly limited by the Bureau of Land Management (BLM) to a tiny number of lucky lottery winners per day. There is no marked trail; hikers receive a pictorial map and GPS coordinates to cross wild, trackless slickrock and deep sand to locate the formation.

Mount Huashan, one of China's Five Great Mountains, is often described in media as one of the most dangerous hikes in the world, although modern safety infrastructure significantly reduces objective risk. Rising dramatically from the plains near Xi'an, the mountain is essentially a massive solid block of sheer granite featuring five distinct peaks. The hike involves a steep ascent (or cable car ride) followed by traversing narrow ridges linking the North, East, South, West, and Central peaks. The mountain is most famous for the optional 'Plank Walk in the Sky' near the South Peak (2,154m), where hikers clip into a fixed steel safety cable while traversing narrow wooden planks bolted into the cliff. It is a demanding experience that blends Taoist religious history with extreme exposure.