Hunting trophies decorate Oregon's most unique bar-restaurant.

This zombie-themed restaurant stands out in the heart of corn country.

The chefs at El Diablo use heat generated by an active volcano to cook the food.

An underwater restaurant, surrounded by a coral reef.

The house and graveyard used in the Stephen King spine-chiller.

The only arched bridge made of stone on the entire Mississippi River.

More than 5,000 contemporary and "historic" mustards from around the world.

An 80-year-old house built out of newspapers.

Mountain known by the Tillamook Tribe as "the place of the supreme deity."

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

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Massive sinkholes on a mountain in one of the most remote places in Venezuela.

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

Curious cave that stays a cool 56 degrees all year long.

The world's longest known cave system.

Enormous lake at the bottom of a unique cave system.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The "World's Largest Underground Business Complex," a 55,000,000-square-foot city underneath Missouri.

A massive underwater sinkhole made famous by Jacques Cousteau.

Bizarre Cavern.

These curious caverns have been home to mushrooms, gangsters, and disco.