Three columns of volcanic rock shoot out of the ocean.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

An encyclopedic collection of mammal penises.

No two pieces are exactly the same at Portland's hippo-themed hardware store.

The world’s largest truck stop includes a barber shop, chiropractor, and a huge museum with antique trucks.

Built in 1869, this now-retired structure looks more like a medieval fortress than a county lock-up.

A sculpture made of 10 Cadillacs as a monument to the “Golden Age” of the American automobile.

Oddly shaped rock formation, misassociated with a nearby utopian community.

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.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

A museum and shop on Bourbon Street located in the French Quarter.

Elvis's own personal tropical hideaway.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

From lefty Jewish gathering site to hip cultural site in just 80 years.

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

See massive fossils that are over 200 million years old in northeastern Arizona.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

It houses the remains of a 17th-century version of the Titanic.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

This chimerical bridge/tunnel appears to dead end right into the sea.

A centuries-old forgotten underworld lies beneath Malta.