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

An ancient capital city that dates back 3,000 years old and harbors many surprises.

On the Oregon coast there is a natural hole that seems to be draining the sea.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

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

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

An exquisite tunnel of cascading flowers.

Rippling sand dunes frozen in the Arizona rock.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A daring D-Day assault by U.S. Army Rangers is commemorated atop the high cliffs of this strategic point.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

This simple badlands butte is the highest point in North Dakota and may be the only high point to charge admission.

This former Mormon settlement is reemerging from the receding waters of Lake Mead.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

A popular rock that acted as a waymarker for American pioneers.

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

This black shoreline is made up of exploded lava particles.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Hide from the tourist hordes in these relatively unknown, and unguarded lava caves.

These picturesque Hawaiian falls are home to a rare species of fish that uses a special sucker to climb up cliffs.