A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

The sign at the garden gate reads: "These Plants Can Kill."

Medicinal spa created with the discharge from a geothermal energy plant.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

An exquisite tunnel of cascading flowers.

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A huge musical instrument played by the ocean.

On Japan's Tashirojima Island, cats are king.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

On the outskirts of a reborn ghost town, a decaying post office remembers the bad old days.

A pair of giant legs paying homage to a poem, a king, and it would seem, socks.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

The cinder cone volcano with a less than complimentary name.