A collection of objects supposedly singed by the hands of souls in purgatory.

This enchanting 600-year-old tree is so magical it inspired the beloved tale of Pinocchio.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

Ruins of a 10th century church tucked away deep in a botanical garden.

This 16th-century monastery has been turned into a surrealist architecture compound.

Jesus' footprints and the first catacombs in the world.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

This former quarry is now a picturesque gorge that hides a sunken lake.

The former home of a trailblazing surrealist is still filled with haunting dolls and grim paintings.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

This former Roman Catholic Church still contains the embalmed hearts and organs of 22 popes.

David Sedaris called it "The greatest shop in the world."

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

The abandoned "Ghost Mansion" was left to decay in the mountains of Northern Italy.

The largest and most famous wax anatomical collection anywhere in the world.

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

Architectural monsters are devouring this palace's every door and window.

The glowing blue Nymphaeum of Emperor Tiberius.

The final resting place of the poets Shelley and Keats.

Venice's "Island of the Mad."

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.