A toxic ghost town sitting atop a massive coal fire.

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

This outpost of America's most popular fast-food restaurant is housed inside a palatial mansion.

Read between the lines of the subway map to find the hidden abandoned Civil War fort.

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

Harlem park dedicated to compulsive hoarders killed by their own junk.

Some of the earliest burial grounds of New York State are to be found hidden away in this quaint town.

The oldest living organism in New York City. Maybe.

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

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

A gigantic 10-foot tall stone man.

The most confusing clock in New York.

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

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

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

There must be a pun in this haystack somewhere...

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

Red frames showcase remnants of one of New York's original subway stations.

"A hideous albatross in the Hudson River Valley."

A millionaire's abandoned swimming pool from the gilded age of one of America's most distinguished families.

An eccentric playboy's astounding natural history collection.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

The former estate of the Guggenheims, part of the opulent Gold Coast that inspired the Great Gatsby.

This once-grand marvel of engineering is now 41 miles of scenic hiking trail.