Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

Abandoned silver mine strewn with wrecked and twisted structures.

The only American museum exclusively dedicated to the exhibition of gloves.

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

The abandoned ruins of America's first private zoo are open for exploration in the Catskills.

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

This cavernous abandoned marble mine is popular with ice skaters in the winter.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

This real life asylum of horrors is now an abandoned ruin that hides the unbreakable code to one patient's insanity.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

World's first "penitentiary," meant to be humane, drove men insane.

A submerged archeological park still holds the wonders of a Roman Sodom.

A 30-acre garden inspired by the principles of modern physics.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

Eighteen miniature death-scene dioramas.

Started as a kitchen garden, now the second largest botanical garden in the world.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

An eerie, derelict amusement park in Berlin.

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

The world's only museum devoted to the wonders of fluorescence.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.