Home to items never before seen by the public.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

A little sculpture with a large wardrobe.

Cozy basement bar sports an inventory of over 2,000 beers.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

A 60-room castle constructed by a horse-racing heir.

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

Macabre astrological automaton clock dating to the late 1400s.

Oldest synagogue in the United States.

Mysterious stone tower featured in many alternative histories of the New World.

This blowhole is supposedly caused by a trapped monster.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

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

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

A marvel of Byzantine engineering under the streets of Istanbul.