A long abandoned hospital building on the outskirts of NYC.

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

The home of one of America's most wealthy industrialists is now a historic site that remembers a more decadent time in the country's history.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

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

The haunting, dilapidated remains of a former poorhouse on Staten Island's Greenbelt.

The decaying ruins of Wales' first asylum for the mentally ill.

Northern Ireland's Brobdingnagian stepping stones.

A museum marks and documents the site of the Titanic's launch.

The ancient tomb acts as a calendar that keeps perfect time.

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

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

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