This massive library holds what was once the largest book collection in the world.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Saintly bones pressed into a wax effigy of a Catholic superstar.

A popular shrine where the Blessed Virgin allegedly appeared in 1830, displaying a holy armchair and two incorruptible remains of Lady Saints.

Stroll through retro Paris while shopping for old postcards and discarded doll heads.

A haunting collection of the vanished and disappearing natural world.

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

A mechanized clock where a man fights off a dragon, crab, and rooster.

Theme park featuring miniature replicas of European monuments.

Historic Hull Street was actually the first street with a proper name in the Boston area.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

This Rhode Island mansion was a stand-in for the exteriors of Collinwood in the original "Dark Shadows" series.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

This area was once known for being a lawless haven for rough-and-tumble sailors, earning the maritime-themed nickname "the black sea."

A church filled with the bones of hundreds of virgins martyrs—or so they say.

The topiary maze at the Habsburg hunting lodge.

Op-art architecture designed for happiness.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

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

A world-class observatory in the California desert.

The first American department store, and home to the largest operating musical instrument in the world.