An extraordinary house museum and cabinet of curiosities in the heart of Florence.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Unbeknownst to most passersby, this marble statue standing outside an office building is a genuine piece of second-century Rome.

The relics of dozens of martyrs are stored in a single chapel.

Statue of a decomposing prince that once held his heart in its hand.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

A homemade anatomical collection of medical anomalies and accidental catastrophes.

The rest of him lived another 61 years and was buried elsewhere.

A gravestone marks where a man's lost limb was laid to rest.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

City law dictates that this mountaintop cathedral containing the heart of a saint is to remain the tallest building in town.

A museum celebrating the Victorian obsession with hair art.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

The final resting place of New England's last "vampire."

Five painted skeletons are hiding behind a church in this tiny village in the Italian Alps.

A road that winds through this natural cave is the only way to access the small, appropriately-named village of Cuevas.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

This ancient hydrological marvel is now the base of a modern outdoor cinema.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.