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

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Ride the subways of yesteryear.

A New York garbage depot holds a secret collection of weird and wonderful refuse.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

A semi-scholarly approach to sex.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

A museum devoted to bringing to light forgotten or neglected histories through exhibitions, education and public programming.

New York's oldest magic store.

Try not to get slimed in Tribeca.

Connecticut's shot tower is near the end of its life.

This historic railway museum may have lost its passengers but not its love for trains.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

137 graves holding New England's earliest residents.

A reliquary of pop culture marvels, including the world's largest (and most terrifying) Jack-in-the-Box.

On top of Gibbet Hill lie the ruins of a lavish turn-of-the-century estate that never quite came to be.

A men’s restroom became a sandwich shop.

What was once a true peninsula has now been filled in, causing the water to recede and leaving many streetside "waterfronts" and landlocked "islands."

This railroad tunnel was once the longest in Massachusetts.

Naturally formed white marble arch housed in an abandoned marble quarry from the 1800s.

From economic backbone of a community to deadly diving hole, these former stone quarries are now a park for rock climbers and graffiti artists.

Resonating tubes make music from highway overpass.

One philanthropist's extensive collection of knick-knacks and curiosities is now a public museum of oddity.

35,000 grape hyacinths flow like water down a garden hill.