Why have you never heard of the second most popular tourist site in New York?

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

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

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

An old abandoned mining town in The Adirondacks where Theodore Roosevelt first learned of the shooting of President William McKinley.

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

This mouldering abandoned mental hospital was once a center for progressive healing.

The famous author's cottage hideaway.

Commemorating the spot where the famous scientist fed his pigeons.

A staggering collection of photographs depicting medical, social, and historical change.

An odd, ancient window that may have once been part of a brutal prison is embedded in the side of New York's Police Plaza.

Home on the Hillside, and home of the first breakfast cereal.

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

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

For over 80 years, Mayan ruins stood proudly in a most unlikely location.

Lady Liberty's first beacon of enlightenment is now displayed in a museum near the statue.

The oldest living tree in Manhattan comes shrouded in sinister legend.

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

The library of every book lover's dreams.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

The former hotel where Tesla invented the radio.

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

This once luxurious Catskills resort is now a haunting ruin.

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