Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

A legendary speakeasy bookstore returns from the brink.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

Become a prohibition rebel.

New York City's smallest piece of private property.

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

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.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

Read a book next to a Midtown waterfall.

A hip bar decorated with walls of golden skulls.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

Elevated freight railway turned wildly successful urban park.

New York's oldest magic store.

The world's largest collection of fine-scale miniatures and one the nation's largest collections of antique toys.

The former site of an all-but-forgotten colonial landmark is now remembered by an often overlooked bas relief.

Beautiful steampunk ghosts of early Massachusetts.

One of the now-less-hidden floral gems of the "Emerald Necklace."

The Old Courthouse takes visitors on a captivating trip through St. Louis' timeline.

Speak to a companion on the other side of the room loud and clear through this architectural anomaly.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

A creepy sculpture of a decapitated head invites viewers to see St. Louis through its empty eyes.

A historic house in St. Louis was plagued by a series of suicides committed by family members involved in a successful brewery.