Eons old volcanic activity created one of the most stunning rock formations in the United States.

This small Irish village suffered the greatest loss of life when the Titanic sank.

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

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

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

Two mammoth statues inspired by equally tall tales lure tourists to this roadside attraction.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

A tiny microvalley etched into the side of Knocknarea Mountain hides another world.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

The echoes of a railroad town that solemnly mark the end of the line.

"You don't need a rocket scientist to build a steam engine, but we've got one." -Museum docent on the credentials of a restoration volunteer.

A tiny survivor of the Donner Party disaster.

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

Singing sand that stands as the final remains of an ancient lake.

The largest drain hole in the world.

California's own majestic geyser is powered by a subterranean volcano.

California's own medieval Italian castle, authentic down to the 300-year-old iron maiden in the dungeon.

The fossilized remains of ancient California redwoods.

A crumbling wizard is one of the final reminders of a roadside Middle Earth.

Hidden beneath a lake for decades, this brutalist mine has now emerged from beneath the receding waters.

Travelers exchange letters with woodland creatures at this mini post office.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

Spiral labyrinth hidden in the hills above Oakland, CA.