A Bibliophile's Dream.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

A fantastic castle rumored to be the birthplace of King Arthur.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

This massive wooden building contains a giant Buddha, healing pillars, and tame deer wandering the grounds.

The trials and tribulations of marking Poe's grave.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

A castle built by an eccentric medieval enthusiast in rural Ohio.

Cryptic messages embedded in the New York City sidewalk.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

An abandoned stretch of highway, deteriorating next to the operational one.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

A dilapidated dock tells the story of Titanic's missed arrival.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

A winding path built in secret on the edge of the continent.

The United States Capitol's former columns still stand.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.