In Tucson a giant metal snake helps pedestrians cross a busy highway.

The world's largest military aircraft cemetery.

A small town Romanian cemetery filled with darkly humorous gravestones.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

A series of labyrinths in the Nevada desert inspire meditation and calmness.

The eroded core of an ancient volcano is now accessible by a short hike.

Now abandoned, the first public health hospital in the U.S. saw more than one million immigrants from around the world.

This graveyard is the eternal home of many brave pioneers who settled the Great Northwest.

This sandstone mansion was the home of two of Oregon's most important pioneers.

Formerly secret, precariously perched boulders.

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

This extravagant Art Nouveau rest stop features a million-dollar view of the Columbia River.

An abandoned asylum where patients have been forgotten but their possessions remain.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.

A popular tourist cave with a dark past.

Roadside collection of 65,000 signs.

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