A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

An underwater city for the dead.

A Hawaiian stairway to heaven—that you can't climb.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A heavenly experience, right here on Terra Firma.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

An homage to everyone's favorite prehistoric cartoon family.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A winding path built in secret on the edge of the continent.

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

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

A beautiful geyser under environmental threat.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Hollowed out cedar log tubs set in an ancient towering forest.

This abandoned amusement park was built on a site with a dark history.

Resting place of Hollywood's immortals is also site of summer film screenings.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

The United States Capitol's former columns still stand.