The hidden lair of an alchemist rediscovered in a 2002 flood.

The remains of a 13th-century Romanesque church lie abandoned on a hillside.

The only natural cave bath in all of Europe.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

This 135-year-old weather station studied the effects of the climate on human health.

Where the lovelorn find a home for their sentimental keepsakes.

How did an Australian statue of the Bard of Avon end up in the Hungarian capital?

Once a meeting point for great thinkers, and the midpoint of the country.

The only surviving piece of Copenhagen's 16th-century defensive wall.

An "evil painter" included pointed symbols in this artwork to poke fun at members of the Danish Parliament.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

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

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

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

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

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

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.

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

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

A brutalist gem towering over the heart of Milan.

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

Artistic tombs, monuments, and a beautiful "Hall of Fame" lurk inside this cemetery.