A petite white lighthouse perched on the ancient core of Stromboli Volcano.

A lonely beacon, precariously perched atop a remote sliver of rock.

The mysterious round rocks of Schooner Gulch.

A hard-to-reach oasis in a desolate corner of Death Valley National Park.

"Only the devil could play golf here."

This amazing ancient cave was kept secret for seven years to protect it from the public.

Each winter this underground cave forms a dazzling ice palace.

A Barbary Coast watering hole built into a Gold Rush shipwreck.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

An inconspicuous footbridge beloved by San Diego locals.

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

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

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

A submerged archeological park still holds the wonders of a Roman Sodom.

The highest tides in the world come in and out here twice a day, allowing you to essentially walk along the ocean floor.

Cathedral carved out of salt, located a mile below the earth's surface.

This picturesque mansion has gone from opulent ruin to nature museum.

A dangling church built over a Colombian gorge.

An explosion of natural color known as "the river that ran away from paradise."

Modern design and unusual architecture make this mountaintop temple no ordinary Buddhist retreat.

This nugget of paradise earned its name for obvious reasons.