Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

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

An intricately carved Viking church overlooks a glistening fjord.

Walk behind a 50-meter-high waterfall.

Norway has built what may be the world's most beautiful public toilet.

Home to three historic ships from the age of Vikings.

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

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

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

The runoff from these fiery cliffs sends red water flowing into the sea.

Fabulous formations, weird and wonderful wildlife.

This rusted shipwreck directly in front of a century-old abandoned lighthouse looks almost surreal.

When humans abandoned this safari lodge, the lions took over.

The "Versailles of the Jungle" built by a dictator is now a decaying shadow of its hubristic grandeur.

Home to pygmy hunter-gatherers, hundreds of animal and bird species, and the strange okapi, or forest giraffe.

The skeletal remains of the famous hominid "Lucy" were found at this spot.

An Ethiopian cloud forest protects some of the last wild arabica plants.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

Ethiopia's "smoking mountain" is in one of the hottest regions on the planet and is home to two lava lakes.

The hottest place on the planet.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

This cave located in the badlands of Somaliland contains some of the oldest cave art in Africa.

All that remains of Jacques Cousteau's 1960s underwater "village."