Collection of vintage trailers double as hotel rooms.

Dramatic river bend surrounds a natural red-rocked pedestal.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Rippling sand dunes frozen in the Arizona rock.

Most-visited and most-photographed slot canyon in the American Southwest.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A monument to a survivor of harsh pioneer life, frostbite, and primitive surgery.

Dig for your own trilobites in this goldmine of invertebrates.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Recycling meets art in this colorful barricade.

One of the American Southwest's most extensive collections of Navajo rock art.

A unique geological area spiked with wind-carved rocks that resemble teepees.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

The secret city built by the Manhattan Project.