This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Thanks to this small string of islands World War II still hasn't officially ended between Russia and Japan.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

Abandoned Nazi train station turned underground astroparticle laboratory.

Where America's first doomsday cult awaited the end of the world.

A little known Colombian theme park of giant curiosities.

According to legend, Bob Dylan sneaks in twice a year to eat dinner with Jack.

The deserted pirate-themed restaurant still entices explorers.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.

This 1967 experiment in modular architecture was designed to be a new model for urban living.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

One of the foremost Sherlock Holmes collections is hidden away at a Toronto library.

This sprawling bookstore spans four floors and has more than a million books in stock.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

On a dusty county road sit the ruins of a ghost town's abandoned church.

The final resting place of many of New Jersey's most famous residents, including U.S. history's most in-vogue antagonist, Aaron Burr.

One man's lifelong obsession with death.

Ruins of a historic medical facility sits eerily by the water.

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