What's left of the ruins of the 1893 Columbian Exhibition, or World's Fair, also known as the White City.

The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

The subtle science of a master molecular gastronomist.

Outstanding taxidermy dioramas showcase the grandeur of the continent's wildlife with spooky realism.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

Piano-making empire filled with 200-year-old steam machines still churning out 1,000 instruments a year.

Unique antiquarian shop specializing in globes, maps, and prints.

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

This collection of grinning ephemera has grown from basement to Brooklyn.

The only home that Alexander Hamilton ever owned has a history almost as troubled as his own.

Reverend Jen's unique museum/living room showcases her troll collection.

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

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

A hands-on traveling collection of the innovative devices of yesteryear.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Elevated freight railway turned wildly successful urban park.

Gigantic private toy museum featuring among finest collections of antique mechanical banks in existence.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A church of bones, decorated with 40,000 human skeletons.

Street artists transformed an abandoned air vent into the beloved Star Wars robot.

The collection of signage remembers the midcentury pushback against the new neon light.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

One of the largest cat sanctuaries in North America is considered a "Club Med" for felines.

An electrifying collection of gadgets and literature from the 16th through 20th centuries.