This opulent hotel has been visited by Spider-Man, Charlie's Angels, and the Ghostbusters.

The ghostly remains of an accidental sea.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

This fireplace-turned-monument pays tribute to the assassinated U.S. president.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

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

This quirky hot springs town known to locals as "T or C" was named after a radio show.

A frozen oasis lies beneath the scorching New Mexico desert.

This bird-shaped rock formation defies gravity, time, and classification.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

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.

Inside this casino, visitors are treated to slot machines and a rare German Christmas pyramid.

The largest source of fossilized insects anywhere.

When ecosystems collide in the arid Southwest.

The site of the gruesome massacre—and maybe cannibalism—of five men, a tragedy that made Alferd Packer infamous.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

The fifth-longest natural arch in the world, and the longest outside China.

At this gas station in the middle of the desert, a convenience store has been carved directly into the rock.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.