The oldest surviving bridge in New York City, which reopened to pedestrians in 2015.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

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

The boulder on which Alexander Hamilton laid his head as he died can still be visited on the New Jersey coast.

One of only two commuter aerial tramways in the United States.

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

One of New York's best collections of pinball is hidden in a secret bar in the back of this laundromat.

Elevated freight railway turned wildly successful urban park.

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

This little museum is built on a theater that was once a wildly elaborate speakeasy.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

Walk over a 150 year old manhole.

Plot your trip through the city on the sidewalk.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.

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

Try not to get slimed in Tribeca.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

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

Visit the site of a subway powered by nothing more than air--and lots of it.

Interactive modern and vintage submarine equipment, World War II relics, and submarine attire.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

North Central Florida's largest flea market and a weekend roadtripper's dream.

Gutted airplanes slowly decay in a Florida field.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.