South West USA
Capitol Reef, Zion, Bryce, the Grand Canyon, Monument Valley, Glen Canyon, White Sands National Monument, Canyonlands and Arches National Parks. This part of the world is awesome.
We hike the SW USA every year and have yet to be disappointed.
Fascinating, diverse and mind-boggling. The best WOW geological zone we’ve seen anywhere.
More correct would be to call this region the Four Corners.
The high desert plateau intersection of the four U.S. states of Utah, Colorado, New Mexico, and Arizona.
The Grand Canyon of the Colorado Plateau is not the deepest nor largest, but it’s by far the most stunningly beautiful on Earth.
Most of the best slot canyons and natural stone arches in the world are here. A desert, your views are unobstructed. The light is perfect for photography.
The best weather is Oct-Nov, Mar-May. Summers are too hot for most hikers.
Most of the hikes in the Four Corners are short due to lack of water and the real risk of getting lost. People die in this wilderness every year.
Our favourite hike in the Four Corners region is Paria Canyon on the border of Arizona and Utah. You enjoy many days beneath huge walls in a slot canyon.
more from our Paria photo set
if you hike Paria you’ll certainly add on a nearby day hike called The Wave.
more Wave photos
More information on on dozens more great adventures on our new SW USA information page.
besthike.com 
*applause*
I live in Scottsdale, Arizona and am an avid hiker. There is not enough time (vacation)and resources ($$) to do all I want to do in this lifetime. So if I ever do a hike twice, it must be spectacular. I’m doing Wire Pass-Buckskin-Paria-Lee’s ferry (the only way to do it) for the second time this April. Note: the wave is by permit only, and thousands (literally) vie for ten spots per day by lottery….good luck.
Definitely the best slot canyon hike in the world.
Enjoy!