Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A model of a galactic embassy is hidden in plain sight along the highway, proposed by a UFO religion to find the aliens that created life on Earth.

This black shoreline is made up of exploded lava particles.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

France's most famous cemetery, with some of its most curious tombs.

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

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Famously misunderstood wonder of the ancient world

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

The personal library of the founder of modern neurology is open to visitors.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

The largest medical and anatomical collection in France lies hidden from the public.

The history of radiation is on safe display at the foot of a radiation science laboratory.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

Paris' linguistic guide to the international language of, yes, love.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

Formerly secret, precariously perched boulders.