A stunning 18th century pharmacy and medieval chemist's collection.

This bone-filled cave got its name after they found 140 bear skeletons inside.

This once-derelict building is now one of the most beautiful bookstores in the world.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

This Romanian village may have been drowned, but it is long from forgotten.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

A muddy alien landscape that is home to rare species of exotic plants.

No one knows who built this strange cave of worship or exactly why.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

This massive underground salt mine now holds a sci-fi theme park in its depths.

Moss and stone turn this waterfall into an otherworldly liquid veil.

The Natural History Museum that time forgot.

A collection of items from a way of life that no longer exists.

A lush indoor jungle fills this bustling Madrid transportation hub.

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

This Cheshire museum has cuckoo clocks, a rare pipe organ and vintage motorbikes. But mostly cuckoo clocks.

The twists and turns of this serpentine maze are over 170 years old.

Three small rooms at the back of the “official” church of London's clowns.

This charming railway is one of the oldest and steepest funiculars in England.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

This 1920s Dutch barge is now a floating bookstore.