A beautiful maze marks where three countries meet.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

This massive collection of taxidermy is full of specimens collected by missionaries during their international travels.

Thousands of well-dressed mummies below a monastery.

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

Haunting graffiti left by prisoners of the Spanish Inquisition.

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

A medieval wash house where people washed clothes in a river allegedly formed by the tears of a mourning nymph.

Where Aleister Crowley taught magick in "La Chambre Des Cauchemars," his "Chamber of Nightmares."

Built on a medieval synagogue, this church has a burial crypt, tunnel system, and Jewish ritual bath hiding deep underneath.

The world's most active stratovolcano is almost always erupting.

The now-abandoned Fascist summer colony served a dark purpose during World War II.

An abandoned village, frozen in time by the threat of a landslide.

A beautiful chapel on the hills of the Oltrepò Pavese claims to house the tomb of King Edward II of England.

This ancient Roman arch misled treasure hunters for centuries.

Architectureal fantasy quarter of Rome.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

Ever hear of the Milazzo Cage?

One of the most important yet well-hidden museums dedicated to the history of medicine.

A wunderkammer of curious objects and intriguing art nestled within a hub of ancient Roman sites.

A forgotten "city of water" underneath the famous Trevi district.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.