Once the local rulers had gone these enchanting ruins housed common folk in an almost real life fairy tale.

This Luxembourg cave is covered in cryptic looking marks left by mining activity.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

Hot springs monkey spa in the middle of Hell's Valley.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

A magical place that lets you play in and explore the world of Studio Ghibli.

A toxic ghost town sitting atop a massive coal fire.

A church of bones, decorated with 40,000 human skeletons.

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

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

At Chicago's revered Field Museum, visitors are invited to learn about and literally explore DNA.

On Japan's Tashirojima Island, cats are king.

The largest drain hole in the world.

Home to three historic ships from the age of Vikings.

Ever-growing collection of devils in art.

Nightmarish example of the unintended consequences of weapons testing.

Spend your honeymoon where the Devil had his wedding.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

One of Ireland's most infamous prisons for rebels including men, women and children.

A 200-year-old prison that now houses a peculiar crime museum.