A large camera obscura, constructed entirely from digitally fabricated components.

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

The site of a tragic massacre that spawned a multimedia franchise.

Ride the subways of yesteryear.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

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

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A mysterious air force base built to resemble a Long Island fishing village.

A fire station-turned-church-turned-museum dedicated to the work of seminal light artist Dan Flavin.

A former poultry store that looks like a giant duck and is one of the "seven wonders" of Long Island.

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

The abandoned grounds and derelict greenhouses of this once-magnificent Edwardian estate are now a nature preserve open for exploration.

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

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

An eccentric playboy's astounding natural history collection.

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

During the 19th century, you could pay for violence off a prix fixe menu on this Manhattan street.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

The modern birthplace of Irish freedom.

The 19th-century pharmacy (now a used bookstore) was featured in James Joyce’s "Ulysses," and has changed very little to this day.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.