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

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.

It houses the remains of a 17th-century version of the Titanic.

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

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

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

Thousands of miniature bronze sculptures have taken over this city square creating a unique art installation.

The painter of "The Scream" is laid to rest under a stoic bust of himself in the humble corner of an Oslo cemetery.

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

St George's Leprosy Museum depicts the gruesome afflictions of those suffering from the disease.

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

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

A monument to the man who almost killed Hitler.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Where once there was a train station bathroom, there is now this German burger joint.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

There must be a pun in this haystack somewhere...

An artist's cute bronze subway sculptures belie his violent artistic past.

A very classy 1920s-era bar right in Grand Central Station.

Elevated freight railway turned wildly successful urban park.

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

This beloved marketplace mascot poops money and grants good luck.