This pond is so stunning it looks like you've stepped into one of Monet's masterpieces.

A little-visited waterfall in an otherworldly landscape.

Natural cathedral designed by Italian artist Giuliano Mauri.

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

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

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

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

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

A colorful architectural gem in Seattle's uniquely modern Central Library.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

"Portugal's Stonehenge" is made up of nut-like stones aligned with the heavens.

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

Under a church hides a forgotten 13th-century ossuary containing the remains of around 2,500 people.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

Statue of death tucked in the University of Medicine courtyard.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The Avenue of Mausolea is a series of grand palatial tombs.

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

The oldest and smallest cemetery in Paris is only open to the public twice a year.

One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.