One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

Antique gaffe kept in the basement of a small Vermont natural history museum.

A Winnebago Tribe collection featuring arrowheads, artwork, and a mysterious rock carving.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

Victorian "Fancy Craft" Hair Wreaths and Relics.

Reclaimed by nature, the ruins of Doodletown, New York are remnants of a town consumed by a state park.

Built as a gift to the hottest tastemaker of the time, these hidden quarters remain an Art Deco showpiece.

This innocent-looking townhome is actually a subway exit.

The end of the 4 Line is also the end of the line for 300,000 souls in one of NYC's most illustrious cemeteries.

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

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

A once grand hotel is being retaken by the wilderness it once capitalized on.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Nondescript elevator doors open to reveal a stunning, surreal world.

An abandoned castle owned and ignored by Masons carries a cursed history.

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

Mysterious 500-year-old tapestries depict a unicorn hunt.

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

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

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

A hands-on traveling collection of the innovative devices of yesteryear.

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