The first declared National Monument in the United States.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

Enormous lake at the bottom of a unique cave system.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

A walk through the historic city center, under the streets of Seattle.

The ghostly remains of an accidental sea.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

A massive underwater sinkhole made famous by Jacques Cousteau.

A toxic ghost town sitting atop a massive coal fire.

"Polynesia on the Plains."

What was to be the world's most secure Cold War document vault ended up as just a few shallow caves.

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

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.

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

This former Mormon settlement is reemerging from the receding waters of Lake Mead.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

One of the world's tallest Ferris wheels takes visitors high above Las Vegas in a spinning party room.

The best Tiki bar in Las Vegas.