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

A golden egg-shaped sauna in the Arctic tundra.

Frequent fliers welcome in this airplane hotel.

At this bohemian accommodation, guests who dream of joining the circus can spend the night in themed wagons.

Swedish skyscraper with a 90° twist.

This chimerical bridge/tunnel appears to dead end right into the sea.

Micro-nation based around a nine-story high illegally built tower.

This contemplative sculpture made out of old machine parts is meant to be the first in a series of sculptures around the world.

The shiny silver little brother to Copenhagen's Little Mermaid statue.

This unique architectural wonder is home to luxury apartments.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

This Danish castle is supposedly haunted by a woman too independent to not be a witch.

This bridge's unique architecture honors nautical heritage and encourages self-awareness.

The greatest amusement park in the world is wall-to-wall farting dogs, puking rats, and cows with exposed breasts for the whole family.

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

The world's first combination ski slope and power plant.

Visitors are treated to a stained glass kaleidoscope interior inside this work of art.

This striking royal residence is the largest Renaissance-style castle in Scandinavia.

Denmark’s never-ending bridge.

This ultra-modern wooden boardwalk turns the ocean into a swimming pool.

A natural wonder in south Denmark.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.

A walkable map of the world, made from soil and stone by one man.