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

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

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

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

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

A museum dedicated to the alleged Roswell Incident.

The trials and tribulations of marking Poe's grave.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

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

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

The magic's in the hole!

The world's longest known cave system.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

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

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

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

The site of the climactic scene from the classic horror film is now a historic landmark.

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

A beautiful geyser under environmental threat.

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

The United States Capitol's former columns still stand.

The first declared National Monument in the United States.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.