The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

Ancient ruins hidden underneath a modern luxury hotel.

This museum is a portal to 20th-century Denmark.

This neighborhood grocery houses a treasure trove of Eastern European delights.

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

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

Unrepaired walls from a 1920 anarchist bomb attack.

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

Check out the underground party scene at the "Burning Man of Brooklyn."

New York City's only preserved family home from the 19th century.

This enormous Hindu temple in Queens serves incredible dosas in its basement canteen.

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

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

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

Become a prohibition rebel.

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

Order scoops of pandan, lychee, and black sesame at this family-run institution.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

A terrific purveyor of natural history objects and curios.