A series of playful yellow penguins share a serious message about the environment.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

An existential riddle in the world's largest ancient castle.

Macabre astrological automaton clock dating to the late 1400s.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

A surreal statue honoring Prague's favorite literary son.

Walk through Czech history in Prague's largest graveyard.

Every inch of this chapel is covered in craftsmanship from across the world.

Behind medieval walls in a corner of bustling Palermo is a breathtaking former mosque once inhabited by a wolf-taming hermit.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

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

Cave shrine on Monte Pellegrino.

Thousands of well-dressed mummies below a monastery.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

A 1,000-year-old church holds the bones of the Christian martyrs who died hiding inside it.

This centuries-old Italian chapel hangs midway down a sheer cliffside.

A lover's walk between hilltop towns, decorated with graffiti love notes.

Five candy-colored villages on the Italian Riviera.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

The bomb-ravaged remains of of a colossal Neptune.

A domed disco abandoned since the '70s now attracts artists and explorers under its unique roof.

The "Mona Lisa" of funerary art.

This 2,000-year-old Doric bridge is still open to pedestrian traffic to this day.