The "Seinfeld" diner.

Cryptic messages embedded in the New York City sidewalk.

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

Slyly buy a shake in the Parker Meridien lobby.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

An unassuming secret door once led to a legendary watering hole.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

New York City's smallest piece of private property.

A semi-scholarly approach to sex.

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

Elevated freight railway turned wildly successful urban park.

New York's oldest magic store.

Try not to get slimed in Tribeca.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

A crumbling hospital from the 1850s on Roosevelt Island.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This public baseball field is a beloved remainder from of one of the most historic stadiums in the country.

Though its branches are painted bright colors by generations of locals, the tree is said to be a haunted portal to hell.

The remains of a religious colony, its amusement park, zoo, and baseball empire.

A quaint miniatures museum that turns its focus towards the lives of Americans in a simpler time.

A popular place to pick up prehistoric coral fossils from the time when Michigan was an ocean.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

Turnip-shaped island just off the Michigan shore in Lake Huron.

Walk the same tracks that once ferried Gilded Age aristocrats to their vacation destinations.