Towns with a resource known as "white gold," valuable enough to fight a war over, now stand ghostly and empty.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

A hidden treasure of an abandoned city lies deep in the jungles of Campeche, Mexico.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

This mountain fissure hides a secret path to a secluded mossy grotto within the rock itself.

A formerly glacier-tipped volcano that inspired none other than Jules Verne.

A serpentine highway twists and turns over the treacherous Norwegian Sea.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

Walk 2,300 feet above the ground on the "Troll's Tongue."

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Famously misunderstood wonder of the ancient world

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

A spiralling hourglass-shaped tower rises from the forests in Denmark.

This almost a century old piece of architecture had been overlooked by most, except for the drunk and the homeless

These small, brass stones commemorate the first Roma victims of the Holocaust.

Massive installation of Europe's negative stereotypes.

Visitors flock to the historic birthplace of radiobalneology for its therapeutic radium treatments.