Two stunning 17th-century libraries and a cabinet of curiosities.

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

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

This faux-seedy Japanese arcade is made up to look like a maze of alleys straight out of a cyberpunk dystopia.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

A snapshot of the city's fascinating voodoo culture.

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

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A terrific purveyor of natural history objects and curios.

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

A motley, fantastical agglomeration of unlikely houseboats along the Shoreham-by-Sea riverbank.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.