Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

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 ordinary street was made infamous by a legendary visit from the devil.

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

The gilded, masterful astronomical clock will calculate time, dates, and planetary positions for thousands of years to come.

A novel collection of medical curiosities housed in an 18th-century surgeon training academy.

20-foot tall lamp mumbles Swedish to celebrate the holidays.

This millstone commemorates a gruesome tale that may have been the source of the city's name.

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

This quarry filled with 65 million-year-old limestone is now home to a nature reserve.

Swedish mice can dine at the Nuts of Life restaurant or take a date to the amousement park.

This castle ruin in the middle of nowhere is a gem for wildlife enthusiasts.

The charming storybook building now houses a small police museum.

The place to be if you love vintage Swedish cars.

A Gothic-inspired fish market is Gothenburg's best place to find loaves and fishes.

A 200-year-old collection of medical paraphernalia in a historic house.

The world's first invisible city square is an homage to a man who pushed the boundaries of art.

It's a mystery how these curious columns wound up in an Edinburgh suburb.

An artist's whimsical transformation of everyday objects.

This 16th-century close preserves an unusual piece of Edinburgh's transportation history.

The healing properties of this well attracted royals and commoners throughout the Middle Ages.

The building where Mary, Queen of Scots was said to have bathed in white wine.

This extraordinary Viking artifact has traveled throughout the city.