An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

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

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

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

These small sculptures pay homage to the lovable star of an iconic Argentine comic strip.

A beautiful young girl said to have been buried alive in her coffin…

The narrowest house in Buenos Aires is less than 10 feet wide.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.

A bright little alley in La Boca is a part of tango history.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

This beautiful fountain was sculpted by a female artist who was ahead of her time.

Geothermal waterfalls in Tuscany.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

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