A former insane asylum despised by Nelly Bly and Charles Dickens is now fashionable apartments.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

A deteriorating 1990s Girl Scout camp in a beautiful lush park on Lake Ontario.

This former theme park in New York's Adirondack Mountains fell into ruin before being resurrected as a state-run campground

Check out the underground party scene at the "Burning Man of Brooklyn."

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

Unrepaired walls from a 1920 anarchist bomb attack.

America's greatest forgotten garden and the former stomping grounds of Son of Sam.

The library of every book lover's dreams.

What was once a trend-setting, phrase-coining icon of architectural splendor is now a rotting, forgotten hulk.

The rough and tumble president's childhood home displays the shirt he was once shot in and the speech that saved him.

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

The absurd creation is a compulsory destination for selfies in Buffalo.

Cryptic messages embedded in the New York City sidewalk.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

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

One man's swirling six-acre monument of stone.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

This wall on a street corner in Lower Manhattan has been a blank canvas for a rotation of renowned artists since the 1980s.

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

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

Decades after testing the polio vaccine on unwitting patients, this historic mental hospital sits in ruin.