Explore the dark underground corridors of this graffiti-covered former military fortification.

This tiny patch of arid sand sits in one of the greenest states in the United States.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

The real-life site of Ichabod Crane's infamous gourd attack.

A curious fountain that has no water and includes Satan, a crab, and 9 giraffes.

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

The site of a tragic massacre that spawned a multimedia franchise.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Visit the monolithic tomb of America's most famous general.

An artist's cute bronze subway sculptures belie his violent artistic past.

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

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

The "Seinfeld" diner.

Mysterious 500-year-old tapestries depict a unicorn hunt.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

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

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

Elevated freight railway turned wildly successful urban park.

A castle inspired by medieval architecture is hidden in the woods of Connecticut.

The oldest continuously inhabited street in America.

This old cement mine has been used as everything from a mushroom farm to a recording studio.

"A hideous albatross in the Hudson River Valley."

The Hudson River School comes alive at this palatial estate.

A once grand hotel is being retaken by the wilderness it once capitalized on.