The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

A Dutch clog company in the town of Zaandam loves the wooden shoes so much it made a museum for them.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

Statue of death tucked in the University of Medicine courtyard.

A museum of magic with a Sadist past.

A surrealist timepiece by the artist of melting clocks.

This palatial spiral staircase was so unusual the name "snail" was given to the noble family who built it.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

A medieval weapon rumored to have been used by the brilliant poet himself.

A plaque on the base of this statue holds a bewitching design.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

Anatomical cabinet holds unexpected treasures.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

Knights Templar are visible inside this stunning Cistercian abbey.

A medieval house with mysterious alchemical inscriptions on its facade

The “Sistine Chapel” of the Middle Ages merges 11th-century science and religion in wondrous hues.

Beautiful views and Roman-style statues on the Italian coast.

Amalfi's pre-industrial history is slowly being engulfed by the lush vegetation of the Ferriere Valley.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.