Oregon's unexpected high desert, displaying layers of time in a colorful show.

Quite simply the largest tree in the world (by volume).

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

San Francisco's newly reopened hands-on science museum.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Macabre astrological automaton clock dating to the late 1400s.

The world's longest known cave system.

A heavenly experience, right here on Terra Firma.

Towering basalt columns, a creation of fire and ice.

This frequently-photographed waterfall takes only a short hike to visit.

A beautiful geyser under environmental threat.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

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

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.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A museum dedicated to the history and exploration of both popular music and science fiction.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

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

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

An abandoned train station in Munich constructed for the 1972 Olympic games.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.