Antelope Canyon, Arizona- After you squeeze into the canyon you're met with a metal ladder to help you get to the bottom. Before the ladder was installed travelers had to rappel to the bottom, and there wouldn't be any way to get out of the canyon at the opposite end without a ladder. Photo by Travis Burke.
The "Wave" near the Utah-Arizona border. Only 20 permits to hike this are issued daily and you have to apply for a lottery-like draw four months in advance for a chance to hike here. Definitely a bucket list place!