New York City's smallest piece of private property.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

A famous songsmith's custom piano, dubbed "High Society," is hidden just out of sight in one of New York's finest hotels.

Long-forgotten artifacts give incredible insight into New York's most glamorous hotel.

The iconic Manhattan corner that was once the site of the Beastie Boys' fake clothing store.

Two New York rooftops are home to the largest rooftop soil farms in the world.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.

The factory for the popular Dumbo location, the Greenpoint shop is a quiet gem.

Prove you deserve to be fed by Kenny Shopsin.

Once America's longest-manned military fort, now an abandoned hulk.

New York's oldest and possibly grandest keeper of books.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

The famous author's cottage hideaway.

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

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

Discovered in a peat bog, these horned helms come from a thousand years before the Viking Age.

The house where a Danish physicist discovered the connection between electricity and magnetism.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

The world's most charming instant portrait studio also happens to be its smallest.

A small collection of magic tricks and memorabilia is now an apartment-sized museum.

The world's first and only escalator for lazy bicycles and their daunted riders.

This Arctic mining town is home to a cat that's spent years masquerading as a fox.