This recently uncovered ad for Lindsay's run at Mayor in 1965 had been hiding for decades underneath a billboard.

In Little Caribbean, an ice-cream shop serves up regional flavors, including soursop, Irish moss, and "greatnut."

This unique house, the only one of its kind in Brooklyn, was built as part of a real estate developer's showcase.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

Volunteer-run library dedicated to exploring five decades of activism history.

A huge resale shop for the cast-offs of the film & television industry.

This innocent-looking townhome is actually a subway exit.

In the middle of downtown Brooklyn lies a 165 year old secret hidden right below the surface (closed to the public indefinitely).

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

This eclectic sculpture garden in Brooklyn, home to a bizarre collection of art, was once a run-down junkyard.

The flagship building of an early national restaurant chain is a superb example of terra cotta art.

The oldest living organism in New York City. Maybe.

This tiny structure was built by the creator of the Brooklyn Bridge.

A unique sculpture park that specializes in the huge and bizarre.

Self-sufficient greenhouse floating on the Hudson River.

The longest step street in the city.

Built in the 1920s, this co-op in the Bronx feels more like an Italian villa than a typical New York apartment building.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

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

A restaurant on Staten Island showcases a different grandmother’s cooking every night.

Staten Island's original central park is the former home of the city water supply as well as thousands of immigrant graves.

This small and serene place for quiet reflection on Staten Island was built in China based on the gardens of the Ming Dynasty.

A town trapped in time - 1958 to be exact.

The collection is exhibited in a Staten Island building modeled on traditional Himalayan architecture.