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

An experimental, automotive replica of Stonehenge.

Famously misunderstood wonder of the ancient world

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The final resting place of New Orleans' most famous voodoo priestess.

This blowhole is supposedly caused by a trapped monster.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

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

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

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

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

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

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

A sprawling collection of over 106,000 toys from around the world.

This popular pilgrimage site offers a hole filled with holy healing dirt.

Stroll through a wonderland of stupendous moss-covered trees.

A giant Troll lurks under one of Seattle's oldest bridges.

A wall of chewing gum moonlights as collective art.

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

Get up close to emus and ostriches, or buy their tasty meat.

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

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