New York City's smallest piece of private property.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

A terrific purveyor of natural history objects and curios.

This hidden labyrinth offers walkers some brief peace of mind.

The massive machine creates cracking displays of indoor lightning.

These whimsical works of art tell the story of the city's past and present.

A three-piece musical sculpture installed between the subway tracks at Kendall Station near MIT.

No one really knows how these old hobby horses got here, but the herd keeps growing.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

An enormous, inside-out glass globe built in 1935.

This fairy tale-themed amusement park is now abandoned, and childhood metaphors abound.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

Mysterious stone tower featured in many alternative histories of the New World.

The exact whereabouts of this surreal cabinet of curiosities are rarely the same place twice.

There are owls with glowing eyes in Herald Square.

A bit of retro transportation flair preserved in the world's largest department store.

New York's oldest magic store.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

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