This one-time health resort was used by aristocrats around the world.

A miniature train-ride through Slovenia's largest cave system.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

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

Murals of the wild parties once held on the frozen River Thames.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

His "Lionheart" is entombed separately from the rest of his body.

A French museum of wrought iron.

The world's largest grapevine has produced a delicious harvest at Hampton Court Palace for almost 250 years.

A quaint medieval millhouse hovers surprisingly above the waters of the Seine.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

A restaurant modeled after feudal Japan, where the waitstaff are trained as ninjas.

The sign at the garden gate reads: “These Plants Can Kill.”

Climb inside an iron crystal magnified 165 billion times its normal size.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

Brussels' favorite peeing boy has a sister.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Christ's blood allegedly preserved in a Belgian town.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

An ancient ossuary in Rouen.