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

Denmark’s never-ending bridge.

The decaying remains of a 1960s mechanical wonderland that never officially closed.

Four alabaster giants contemplate the tides on the shore of Denmark.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

The oldest amusement park in the world has been providing a nice spot to have some fun since the 1500s.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

A little-known cafe in an old copper bridge tower with 360-degree views of the harbor.

A natural wonder in south Denmark.

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

This secret collection of the strange and occult was rediscovered in a forgotten room of an old house.

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

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

Street artists transformed this abandoned industrial neighborhood into one of Europe's largest graffiti exhibitions.

Stockholm's deepest subway station is also a stunning ecological wonder.

Dine on food tied to Viking history and legend at this subterranean Stockholm spot.

A hidden bathhouse in one of Stockholm's oldest and busiest neighborhoods is open to anyone who can find it.

An illuminated manuscript comprising the life's work of a lone monk, inexplicably decorated with a portrait of Satan himself.

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

The largest bottled beer collection in the world holds over 22,000 unique beer bottles.

Six beautiful wooden giants are hidden around Copenhagen.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.