The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

The beautiful tunnel that ran from the lobby to Penn Station is still hidden underneath 34th Street.

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

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

This Fifth Avenue church has long been the favored worshiping place of Broadway actors and vaudeville performers.

Tucked away amidst some of the most famous addresses in the world is New York's only fraction of a street.

A DIY art gallery/music venue/lecture hall dedicated to video game culture.

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

Elevated freight railway turned wildly successful urban park.

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

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

New York's oldest magic store.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Once living up to its name as the grandest hotel in all of Africa, the Grande Hotel is now home to a community of squatters.

This witch statue remembers a time in England's history when fear trumped truth.

Willy Wonka would love this weird half-a-home.

Lewis Carroll's White Rabbit or something else altogether?

Following the trail of an old metro line, this scenic path is haunted by a creepy spriggan statue.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

Mind-blowing carvings and fantasy ice scenes grace the largest year-round ice environment in the world.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

The final resting place of the great navigator, or maybe his brother.

Gargoyle head that brings good luck.