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

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

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

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

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

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

An eerie, little-known Neapolitan museum filled with preserved human remains.

This Neapolitan exhibition hall grants weird and wonderful insight into the intricacies of human biology.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

Venice's "Island of the Mad."

This community on a small Venetian island has taken to painting their houses in bright neon hues.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Cat art as far as the eye can see.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

The world's only museum devoted to the wonders of fluorescence.

Museum preserving torture methods from the past.

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

This classic restaurant features a gorgeous mirror-clad room.

The most visited, and possibly most controversial, museum in Germany.