Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

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

The cinder cone volcano with a less than complimentary name.

Legends surround this jagged rock formation in the New Mexico desert.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Ute tour guides have been sharing the ancient dwellings and rock art inside this large park with visitors for more than 40 years.

The location where the iconic movie character declared it was time to go home.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

More than a century old, this trading post resides in the Navajo Nation.

A sharp bend in a dramatic river canyon cut through red rocks.

The unusual patterns in this rock formation result from two distinct modes of weathering.

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.

A tunnel with windows, so you don't miss out on the impressive views.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

A natural dome made of volcanic glass in Inyo National Forest.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

A carnivorous plant paradise in a serpentine bog.

You might recognize this historic Oregon mansion from its appearance in 'The Goonies.'

A glimpse into the "Logging Capital of the World" at a time when there was far more forest and far less machinery.

One man's eclectic collection of treasures found at sea.

Shoreline strewn with the remains of ghostly fallen trees.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

Home to the deepest rift anywhere on Earth.

Supposedly Satanic numbers adorn this preserved submarine sail.