A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

Monasteries on rock pillars, once accessible only by frayed ropes.

The hallucinogenic center of the ancient world.

This record shop and unofficial black metal museum is an ode to Oslo's heaviest musical export.

Norway's oldest cathedral still in use.

This floating sculpture of ice is a poignant reminder of nature's power.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

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

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

A Viking-style brewpub named for a Norse sea giant, in the heart of fjord country.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

Walk behind a 50-meter-high waterfall.

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.

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

For centuries, Jeddah’s old town was a major trading port and a point of entry for Hajj pilgrims traveling by sea.

A 900-year-old village located in the highland of the Asir region that features historic architecture.

The rocks around this mountain are filled with so many carvings that the area became known as the "open library."

This giant volcanic crater holds its very own field of salt.

A 19th-century fortress and collection of artifacts offer a tour of Saudi history.