An isolated dive site teeming with cnidarians.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

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

This volcanic cave lake is essentially hard proof that Iceland is the most magical place on Earth.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Every autumn, this hillside is ablaze with red summer cypress.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

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

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

Once the most densely populated place in the world, this island is now a ghost town.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

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

A 30-acre garden inspired by the principles of modern physics.

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A beautiful geyser under environmental threat.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Pompeii's less famous neighbor is still revealing her secrets.

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

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

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A psychedelic labyrinth on the San Francisco bay.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.