The largest whale museum in Europe allows visitors to walk among life-size giants.

This natural Icelandic fissure allows divers to swim right between two volatile tectonic plates.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

This lake-bound geographical marker sits at the point where three European countries intersect.

A subterranean house of worship carved right out of the bedrock.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

Denmark's famous pseudo-hill.

These old World War II fortifications have been transformed into an unusual equine attraction.

Remnants of the Nazis' occupation of Denmark linger along the sand.

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

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.

Bored potato-guarding Nazis etched their thoughts onto a brick storage building in Copenhagen's Meatpacking District.

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

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

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

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Copenhagen's celebrated theme park and gardens.

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

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.

A stunning silver lining to global warming's gloomy cloud.

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

Not quite the cultural gateway between China and Sweden its designer imagined.

Frequent fliers welcome in this airplane hotel.