Angel's Landing, Zion National Park, UT
Credit: Ed Freeman / Getty Images

Perhaps the most famous excursion through the brutal, otherworldly red rock landscape of Utah's Zion National Park, Angel's Landing is also undoubtedly its most hair-raising. The two and a half mile trail leading to Angel is pleasant enough for nearly any level of hiker, with sections that are even paved. It's after you've surmounted Walter's Wiggles – a series of 21 switchbacks – and then Scout Lookout when you've reached the last turnaround point. From then for the final half mile  it's a tight squeeze through carved rock, steep and narrow ridges and points only accessible with the help of support chains that are bolted to the rock walls. Make it through and you'll be rewarded with a majestic view from nearly 6,000 feet.