A crumbling hospital from the 1850s on Roosevelt Island.

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

An isolated beacon with a history of grisly murder and a view of some of literature's greatest inspirations.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

All that remains of a magnate's dream home is a historic gate and an abandoned public pool.

Some of the earliest burial grounds of New York State are to be found hidden away in this quaint town.

Spies, love letters, and ghost stories have all left their mark on this home-cum-museum.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

The last standing puppet theater on Long Island.

An unrealized dream to wirelessly electrify the entire Earth.

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

This graceful little figure is a one-of-a-kind version of the cherished character.

This forgotten graveyard in rural New York State once served a pioneering hospital.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

A formerly abandoned mental institute, now back in business.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

The largest collection of handbags in the world, the oldest of which were used to carry Bibles, primarily by men.

Seven mini rowhouses fill the gap between 54 and 70 Westerstraat.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

A beautifully eclectic mix of architectural styles.

The attic of a four-century-old canal house hides a clandestine church.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Cat art as far as the eye can see.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.