In Rome’s Jewish ghetto, a 200-year-old bakery still makes the neighborhood’s historic sweets.

An alchemist's "magic door" stands in the middle of a Roman park.

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

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

Once frequented by heavyweights of the Russian arts scene, this café is stuck in the 1800s.

It's hard to believe the dizzying patterns covering this abandoned mine are completely natural.

This ancient village and its adjoining cemetery have a beautiful history of death and remembrance.

This lovely little bridge hidden in a Switzerland gorge is essentially a fairytale.

Caves famous for the dragon-slaying saint who lived there.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

A 200-year-old tavern challenges guests to finish a glass of wine while hanging from a ceiling beam.

An eerie, derelict amusement park in Berlin.

The fairy tale castle of the "fairy-tale king."

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.