One of only two commuter aerial tramways in the United States.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

Visit the site of a subway powered by nothing more than air--and lots of it.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A dark, dank room in subterranean Manhattan was the site of a ghastly murder.

Try not to get slimed in Tribeca.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

The site of the deadly Triangle Shirtwaist Factory Fire.

Unlock the secrets of the conjuring arts.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

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

Remnants of a storybook amusement park hidden behind a strip mall.

Pennsylvanian mass grave and possibly mass murder.

Town of spiritualists and mediums in Florida.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

There's a 12-foot-tall replica of the Washington Monument hidden under a manhole nearby.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

There’s a hidden military meme engraved on the World War II Memorial.

The winding route passes through an enclosed alleyway, two tunnels, and leads to the White House basement.

Decades before the scandal, this staircase on the river was a literal "water gate."

In which a local geological marvel becomes a quaint roadside attraction.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

Mysterious rocks that ring musically when struck.