The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Secret North Korean passage discovered below the world's most dangerous border.

Largest graveyard in all of Japan surrounds a famous mausoleum.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

Along a California highway is a kind of Jurassic Park made of metal.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

A world-class observatory in the California desert.

The famous aviator's final resting place is a study in natural beauty.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

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

The deadliest diving spot in the world is also a stunning geological marvel.

The ancient latrines of the Greeks, in all their public glory.

This famous city eluded concrete detection until the early 2000's.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

Nimrod Polar Expedition base, and home to hundred-year-old frozen whisky.

Five miles of underground river link lake to ocean.

An isolated dive site teeming with cnidarians.

If astronomy had a ghost, it would look like this observatory.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.