This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

A visionary precursor to the Internet made of index cards.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

The mark of the Devil's horns on a marble column in Milan.

See what remains of a once grand ancient Roman circus.

A brutalist gem towering over the heart of Milan.

This giant middle finger statue sends an unambiguous message to Italy's bankers.

The secret medieval communication system will whisk your words above the noise of the crowd.

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

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Though many were skeptical at first, these animal-specific routes across the Trans-Canada Highway have been a major conservation success.

Few other hotels can rival the grandeur of the Castle in the Rockies.

Try the alligator at this fondue spot, which has been catering to "lovers and hedonists" since 1967.

Explore the 500-year history of silk-making in Lyon at this museum, workshop, and boutique.

A colorful piece of contemporary art cheerfully clashes with Lyon's historical architecture.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

For hundreds of years, automatons moving to metallic music have been marking the passage of time.

Hundreds of hidden passageways weave through the old quarters of Lyon.

Order “Proletariat’s Cutlet” at this communist-themed restaurant allegedly once visited by Lenin.

Atop this library is one of the most beautiful green spaces in Warsaw.

Catch a scenic view of Warsaw's Old Town from the top of a centuries-old dumping ground.

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

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