This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Unusual building appears to be haphazardly built from randomly piled bricks.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Ancient rock-hewn town that witnessed key events of Georgian history.

Underground monastery and fortress.

In downtown Oslo, a menacing and terrifying relief clings to a church wall.

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

The world's largest moose statue towers above the highway between Oslo and Trondheim.

Oslo's historic toboggan run has been letting thrill seekers slide from train stop to train stop for over a century.

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.

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

For six months of the year, three giant mirrors direct a pool of sunshine onto this otherwise occluded town.

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

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

Home to three historic ships from the age of Vikings.

Legend has it that a Dutch fisherman lost control of his Shetland pony and tumbled from this cliff.

The unexpected mascot of Shetland's capital.

One of the world's first dedicated bank buildings in the world is now the oldest one.

Several cannonballs of mysterious origins decorate two buildings in Stortoget's main square.

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.