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.

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

Jesus' footprints and the first catacombs in the world.

An alchemist's "magic door" stands in the middle of a Roman park.

Erotic art covers the walls of the largest ancient pleasure palace.

On the Oregon coast there is a natural hole that seems to be draining the sea.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

A fascinating assortment of cave dwellings, medieval ruins, and sarcophagi are being devoured by the forest.

A cave in southern Italy adorned with thousand-year-old Biblical frescoes existed in obscurity until fairly recently.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

Thousands of well-dressed mummies below a monastery.

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

The Neapolitan Cult of the Dead still cares for the skulls at this mini-Fontanelle.

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

This grisly effigy displays an early Christian martyr who was skinned alive and beheaded.

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

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

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

The middle finger of modernity.

The oldest operating pharmacy in the world features 800-year-old recipes.

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

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