The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

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

A towering tribute to decisiveness stands on the spot where Brigham Young and his followers decided that this must be the place.

This gallery of prehistoric red ochre art lines the wall of a scenic segment in Utah's San Rafael Swell.

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

The largest island on the great salt lake is home to curious creatures and strange stories.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

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

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A newspaper building that made radio history.

A mountain range on an active U.S. Navy base hides thousands of mysterious prehistoric rock carvings.

One of the most elaborate displays of Jellyfish is on display at the aquarium.

Puzzling...this tree looks like an assemblage of dismembered monkey limbs.

This quirky UFO-shaped curiosity is often mistaken for the airport’s control tower.

One of Hollywood’s favorite government buildings.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Everything you always wanted to know about borates is here.

A herd of 150 bison live on California's Santa Catalina Island and are at the heart of an ongoing debate between environmental protection and economic expansion.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

The sea once considered an ecological wasteland is now called "crown jewel of avian biodiversity" by scientists.

A popular winter vacation destination for migrating monarch butterflies.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

Every year, over 25,000 monarchs overwinter in Pacific Grove.

Remains of a Greek freighter trapped off of Rocky Point in 1961.