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

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

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

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

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

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

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

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

The colorful stairs are made with marble from the world's major quarries.

The skulls and bones of thousands of soldiers line the walls of this small Italian chapel.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

One of the world's largest collections of medieval religious art.

The giant statue and its model solar system honor the native Pole who declared that the Earth revolves around the Sun.

The last king of Poland was interred in this church nearly 200 years after his death.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

This bell stars in a tragic love tale and is said to make wishes come true.

Legend says this is actually a heartbroken prince waiting for his true love's kiss.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

A heavily politicized roundabout discussing the state of a heavily politicized country.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

Hundreds of notes give thanks to the patron saint of lost causes.

Flamboyant architecture from the turn of 20th century.

3,000 market stands in five former Zeppelin hangars.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.